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b4056c5461d9bb625998cfc63c1780da | 1.lim x → -infinity {x 4 sin(1/x) +x 2 } /{1+ixi 3 } =? 2.if f(x) is twicw differentiable function such that f(a)=0, f(b)=2, f(c)=-1, f(d)=2, f(e)=0, where a | askiitians.com | 2021.25 | [
{
"text": "hllo lakshmi! since in your qstn x is tending to reach minus infinity, the answer will be infinity. explaination: sin(1/x) range is betwn [-1,1] thus whatever ould be the limit it will give some finite value between -1 to 1. now if u think about x exponentials, then degree/power in numerator is greater than in denominator. and hence in such cases the the nswer is infinite. hence even power is associated with numerator.",
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57e68461204f05395e9ae4f90ea1411b | why are caterpillar tracks used in battle tanks instead of tyres ? | askiitians.com | 2021.21 | [
{
"text": "caterpillar tracks are used in battle tanks instead of tyres to increase the area of contact. as a result they can even cross sinking grounds as the pressure exerted on the ground is less.",
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34dfb390cac412a2fc8f1ce9eb7ef876 | werner theory states that every metal cation has a fixed coordination no. but if we consider k4[fe(cn)6] and [fe(cl)4]^-2 the coordination no. of iron in both cases is different? | askiitians.com | 2021.43 | [
{
"text": "@ arundhati fr can exist in 2 forms , that is +2 state and +3 state , so, the two states should have to be considered diffrently , and werner theory fails for such compounds , which can exist as two states , hope it clears all the best ..",
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"text": "@sir, in the above ques,fe in both the compounds is in +2state and has different coordination numbers",
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b7d9c955b5edf0430ca45137cc58077f | want to know the expected cut off for iist?? | askiitians.com | 2021.21 | [
{
"text": "i hope the query is resolved",
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508e47909aa9ddbf33e5162c1340973a | sir/madam is there any medical branch in iaf ? and what is the processor by which girls can apply cid or cbi and on what posts | askiitians.com | 2021.21 | [
{
"text": "is there nobdy who is able to give my answer pls send ans its the question of my career pls..............",
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144489705e6f7cf2257aadde88d25166 | is national entrance screening test (nest) 2011 a gud test to write and tell me abt it clearly sir...... | askiitians.com | 2021.31 | [
{
"text": "dear student yes its a good exam. if you have passion to go to research field and want to be a scientist then its a very good opportunity for you. for more information related to institutes follow link http://nestexam.in/ all the best. akash goyal askiitiansexpert-iit delhi please feel free to post as many doubts on our discussion forum as you can. we are all iitians and here to help you in your iit jee preparation. win exciting gifts by answering the questions on discussion forum. so help discuss any query on askiitians forum and become an elite expert league askiitian. now you score 5+15 points by uploading your pic and downloading the askiitians toolbar respectively : click here to download the toolbar..",
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cd3836cef315fd6479895715c6baaea6 | find the centre of mass of a uniform plate having semicircular inner and outer boundaries of radii r 1 and r 2(for fig.refer q11 of chapter 11) | askiitians.com | 2021.31 | [
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"text": "dear pooja, please post the complete question with image here. we are all iitians and here to help you in your iit jee preparation. now you can win exciting gifts by answering the questions on discussion forum. so help discuss any query on askiitians forum and become an elite expert league askiitian. now you score 5+15 points by uploading your pic and downloading the askiitians toolbar : click here to download the toolbar.. all the best!!",
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42a117c929a44ff978f199040d7383c8 | hello ….. can you tell the structure of ice with simple diagram ?? | askiitians.com | 2021.21 | [
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"text": "it possesses a regular crystalline structure based on the molecule of water, which consists of a single oxygen atom covalently bonded to two hydrogen atoms, or h–o–h. however, many of the physical properties of water and ice are controlled by the formation of hydrogen bonds between adjacent oxygen and hydrogen atoms. hope it clears now",
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309fb63d9f236bb754f00327f01f5f56 | hello sir i am getting 311 in bitsat 2012 what should i expect | askiitians.com | 2021.25 | [
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"text": "you could get any bits campus....n gd brnch in hydrabad n goa",
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"text": "all courses at hyderabad n goa. pilani- cs/eee/mech no chance. civil n chem borderline. eni & fiver year course. offcourse.",
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"text": "you will get civil in bits pilani please share you experience, how was the paper. and what marks had others got? and please tell the standard of the paper, how was chemistry. reply as soon as possible.. thanks.",
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"text": "hey hw was it ?? tough easy..?",
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"text": "hey pls hlp..i hav my bitsat tmrw..pls gv me sm tips...hw ws d tst.?..dificulty level..??..some questins if u rmmbr...",
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"text": "all courses at goa n hyderbad. all but cs/eee/mech/eni at pilani please approve my answer !!",
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{
"text": "hi..how was the level of bitsat 2012? plz reply me asap..",
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"text": "paper wlas easy math was bit lengthy and many toppers are not getting good marks in it some are not able to score 300",
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{
"text": "paper was very easy it just depend in how many ques you attempt",
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f1db26b1d66edcff3afb582759858e1c | which of the following elements is essential for photosynthesis as well as helps to maintain the structure of protein factory of the cell? (1) mg (2) n (3) fe (4) ca | askiitians.com | 2021.39 | [
{
"text": "@ vansh option no 1 will turns out to be the correct option . one atom of magnesium is present at the center of combination of eight nitrogen containing carbon rings . its also the only element which is present at the center of chlorophyll molecule , hope it clears all the best ..",
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9f7f30b58f8534053719ef82b438c0b3 | hiiii | askiitians.com | 2021.31 | [
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"text": "hi arvind, please ask your question, so that we can help you regards",
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32ede75db5003f3f5a50bcd5942c68b1 | how to start revising 11 th if some concepts are not clear? | askiitians.com | 2021.21 | [
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"text": "dear student, start studying the chapters in which you are weak and make the proper notes of that chapters. thanks.",
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"text": "go to the simple approach.. http://www.askiitians.com/revision-notes/",
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2e7b4ee929f645d956b8c045ce85ca24 | if f (1) = 4; f ′ (1) = 2, find the value of the derivative of log f(ex) w.r.t x at the point x = 0. | askiitians.com | 2021.21 | [
{
"text": "let g(x)=log f(e x ) so, g’(x)=[1/f(e x )][f’(e x )] applying chain rule, we get now, put the values to obtain the answer.",
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f66fd985f045e548faea84849d422ec8 | what is difference between vibration and occilation | askiitians.com | 2021.25 | [
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"text": "dear vijay oscillation is rythmic process of object to continoue it's repeating at cirtain interval of time, that interval is almost constant or propotionately decreasing. under stimulated external force with cirtain magnitude and direction produce oscillation of object, with continuously decreasing repeatation time interval in travelling path. vibration is just a random motion of an object within limited path of movement it doesn't show any rytham or continous repeatation or like that, so, vibration is random motion of object under external forces, doesnt follow any propotionality. please feel free to post as many doubts on our discussion forum as you can.we will get you the answer and detailed solution very quickly. all the best. regards, askiitians experts prudhvi teja now you can win exciting gifts by answering the questions on discussion forum. so help discuss any query on askiitians forum and become an elite expert league askiitian",
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6395ea36bdc0736743fce941595fc77b | sir i secured 3324 rank in aieee 2011 what would be d best college 4 me? | askiitians.com | 2021.43 | [
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"text": "dear trisha, congratulations ,,!!!! at your rank you can get admission in any of the top nits like nit warangal, nit trihy or nit kurukshetra with any of your desired branch. best of luck cracking iit just got more exciting,it’s not just all about getting assistance from iitians, alongside target achievement and rewards play an important role. askiitians has it all for you, wherein you get assistance only from iitians for your preparation and win exciting gifts by answering queries in the discussion forums. reward points 5 + 15 for all those who upload their pic and download the askiitians toolbar, just a simple click here to download the toolbar…. so start the brain storming…. become a leader with elite expert league askiitians thanks aman bansal askiitian expert",
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021e61c9d438f63662bddd1bfa8b3a8e | if the orthocentre of a triangle is at (4,5) and the centroid is at (3,3), where is the circumcentre located? answer is (2.5,2). please explain. | askiitians.com | 2021.21 | [
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"text": "so.. centroid is dividing orhtocentre and circumcentre in 2:1 internally use section formula if the circumcentre is (x, y) for x-coordinate: 3 = (4*1 + 2* x)/ 3 ….....(1) 9 =(4*1 + 2* x) 5 = 2 * x so x = 5/2 = 2.5 for y-coordinate: 3 = (5*1 + 2* y )/ 3 9 =(5*1 + 2* y) 4 = 2*y so y = 2 so coordinates of circumcentre is ( 2.5 , 2) thanks and regards",
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d79634aeb27fbc955b4a62e0c366de19 | who published the systema naturae and philsophique zoologique? | askiitians.com | 2021.39 | [
{
"text": "systema naturae is the major work of the swedish botanist, zoologist and physician carl linnaeus . and philosophie zoologique is an 1809 book by the french naturalist jean-baptiste lamarck",
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"text": "syestema naturae is the publised by carl linneus in1 august 1758 and philosophie zoologique is an 1809 book by the french naturalist jean-baptiste lamarck",
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"text": "systema nature was publish by carlous linnaeus in 1758 which described binomial nomenclauture in its 10 th edition in chapter no. 14 th . he was also the father of old systematics.",
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e0d6646ee593091883b2dc905dd9fbe9 | algebra | askiitians.com | 2021.43 | [
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"text": "dear priya, algebra is the branch of mathematics concerning the study of the rules of operations and relations, and the constructions and concepts arising from them, including terms, polynomials, equations and algebraic structures. together with geometry, analysis, topology, combinatorics, and number theory, algebra is one of the main branches of pure mathematics. we are all iitians and here to help you in your iit jee preparation. now you can win exciting gifts by answering the questions on discussion forum. so help discuss any query on askiitians forum and become an elite expert league askiitian. now you score 5+15 points by uploading your pic and downloading the askiitians toolbar : click here to download the toolbar.. all the best!!",
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"text": "dear avsubrahmanyam avula , please post you question dear. i will give you the solution as fast as i can ! thank you !",
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4bce8f12f87dc4889b01ea679de312a8 | is q/t=p in thermal properties of matter............................................................ | askiitians.com | 2021.43 | [
{
"text": "dear student please specify the terms used i. this express then only answer can be given. regards arun",
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19c7b4e294fb1f8bf6f9fa997a887009 | four charges q q q q placed at corners a b c d of a square of side a arranged in a given order calculate intensity at the centre of a square | askiitians.com | 2021.21 | [
{
"text": "assuming by intensity you mean electric field intensity.if you draw the electric field vectors for th",
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"text": "(where r is length of the square) but different directions. if you add up the vectors then they will add up to 0. assuming by intensity you mean electric field intensity.if you draw the electric field vectors for the centre of the square you will find that all vectors have equal magitude= hence electric field at the center of the square is 0.",
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eafe9448fdfe8ccee52586e12484fa5a | a ball is thrown vertically upwards from the ground. if t1 and t2 are the respective time taken in going and coming down and the air resistance is ignored then , which of the following option is correct t1>t2 t2>t1 t1=t2 | askiitians.com | 2021.21 | [
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"text": "according to me its , 2 nd option, t2>t1",
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"text": ".",
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"text": "3 rd option is the answer",
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d81c935d23873ff1aef643b6d287cef3 | sir plz help me. which is better iit bhu electronics/electrical or iit bombay civil? i have to arrange it in jee choice filling | askiitians.com | 2021.39 | [
{
"text": "dear friend, let me tell you that a good thing is electrical dept. is relatively stress free. there used to be some good professors and some of the courses like digital electronics and microprocessors are really cool. placement scene was okay in my time - infosys, tcs picked up half the junta. some core electrical companies like abb, pgcl used to come to the campus. maybe it’s better now. you can get good grades without studying much. i read somewhere that nowadays most of the software companies (even facebook) is open to electrical branch, i don’t know for sure - someone who is from iit bhu electrical studying there or recently passed out will know. bad thing is electrical engineering in bhu is different from what is normally called electrical engg. in the iits. in the iits they teach both core electrical and electronics under the same branch “electrical”. that doesn’t happen in iit bhu. in bhu electrical and electronics are different branches. the electrical curriculum is crammed towards power systems/control systems. although they have some computer science/electronics courses it’s not enough.i am not going to comment on parts of your question to do with civil engineering etc, as there is not much scope for civil branch these days. anyway, you may choose either of these institutions – gitam institute of technology, vishakhapatnam,............................dpg institute of technology and management, gurgaon,...........................lovely professional university, phagwara",
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13749494f8e0e145759cbe8b9c0c59f2 | sir my aieee air rank is 8345and state rank is 550 from bhopal.which nit and branch i will get | askiitians.com | 2021.21 | [
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"text": "dear ishan in nit bhopal you can get any branch under home state quota. in other top nits you may not get branch like computer science,electrical,mechanical. but in other nits you can these branch also. check the link for all the option available for you in different nits http://ccb.nic.in/ccb2009/aieeecouns09/orcr/selectinst.aspx please feel free to post as many doubts on our discussion forum as you can. we will get you the answer and detailed solution very quickly. all the best. regards, askiitians experts badiuddin",
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66dd06583dcbc3639add32bc77ec8915 | magnetic field near current carrying straight wire using biot savarts law and amperes law | askiitians.com | 2021.39 | [
{
"text": "the mathematical description of mgnetic field b due to current carrrying wire is called biot savart law, it gives b at a selected point. amper’s law is used when we want to calculate the magnetic field at a distance r from the centr of the wire carrying a steady current i.in this the current is unifrmly distributed through the cross section of wire.",
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775150249c0e7dea5fe4bb04b9336a5b | the difference between a nuclear reactor and an atomic bomb is that [a]no chain reaction takes place in nuclear reactor, while in the atomic bomb there is a chain reaction [b]the chain reaction in nuclear reactor is controlled [c]the chain reaction in nuclear reactor is not controlled [d]no chain reaction takes place in atomic bomb while it takes place in nuclear reactor | askiitians.com | 2021.39 | [
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"text": "b",
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"text": "[b]the chain reaction in nuclear reactor is controlled",
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"text": "[b]",
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"text": "b",
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b458251ed87661d40b97124fff9bf29b | which is a better option ? metullurgy in pec or civil in thapar or any stream like ece or mech. in any other college..........or should i prefer any stream in nits........ | askiitians.com | 2021.31 | [
{
"text": "hi pec is a much more recognised college than thapar, now if u are concerned about the scope of metallurgy in india , then also its fine. you have a lot of options and can generally specialize even during undergraduate coursework. there is really quite a spectrum of jobs for someone with that type of degree. some different industries are: mining or raw material extraction raw materials refiners/suppliers (aluminum/steel/etc) aerospace oil companies (generally for failure analysis or corrosion) manufacturing (forging, casting, other materials fabrication of metals, plastics, ceramics) thin films, optical coatings, etc consulting/research laboratory services if you want to go on to work on an ms or phd, there's a broad range of things you can study as well: alloys failure analysis ceramics corrosion welding thin films mechanical metallurgy plastics otherwise if u are stilll unsure about metallurgy then go for civil engg. coz its an old branch too, and has also got a good scope with infrastructure development taking place in india at such a good pace. thapar institute is also reputed but pec is preferred before that.",
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47fca7ecb331653442dfeb24d93e32dc | <p>please tell me which jee are conducted by iit kanpur?</p> | askiitians.com | 2021.39 | [
{
"text": "dear nikhil, iit -kanpur is coordinating the ( iit - jee ) for 2011, last year it was coordinated by iit madras. please feel free to ask your queries here. we are all iitians and here to help you in your iit jee preparation. all the best. win exciting gifts by answering the questions on discussion forum. so help discuss any query on askiitians forum and become an elite expert league askiitian. now you score 5+15 points by uploading your pic and downloading the askiitians toolbar respectively : click here to download the toolbar.. askiitians expert anil pannikar",
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0999cac8334f25df6c2cfe4d8944286c | what is astigmatism ? | askiitians.com | 2021.39 | [
{
"text": "astigmatismis an optical defect in which vision is blurred due to the inability of the optics of the eye to focus a point object into a sharp focused image on the retina. this may be due to an irregular or toric curvature of thecorneaorlens. the two types of astigmatism are regular and irregular.irregular astigmatismis often caused by a corneal scar or scattering in the crystalline lens, and cannot be corrected by standard spectacle lenses, but can be corrected by contact lenses. the more commonregular astigmatismarising from either the cornea or crystalline lens can be corrected byeyeglassesortoric lenses. a 'toric' surface resembles a section of the surface of arugby ballor adoughnutwhere there are two regular radii, one smaller than the other one. this optical shape gives rise to astigmatism in the eye.",
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"text": "astigmatismis an optical defect in which vision is blurred due to the inability of the optics of the eye to focus a point object into a sharp focused image on the retina. this may be due to an irregular or toric curvature of thecorneaorlens. the two types of astigmatism are regular and irregular.irregular astigmatismis often caused by a corneal scar or scattering in the crystalline lens, and cannot be corrected by standard spectacle lenses, but can be corrected by contact lenses. the more commonregular astigmatismarising from either the cornea or crystalline lens can be corrected byeyeglassesortoric lenses. a 'toric' surface resembles a section of the surface of arugby ballor adoughnutwhere there are two regular radii, one smaller than the other one. this optical shape gives rise to astigmatism in the eye.",
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a5b7e106c3ee447e3f0382f43211b73a | how to learn plant kingdom ? any ways to learn them without forgetting them ? any smart way ? | askiitians.com | 2021.43 | [
{
"text": "plant kingdom is something which you will have to remeber by heart. there is no other shortcut possible for it. you should read it again and again and try to connect points and try to remember the sequence of various species according to evolution. you should be able to comprehend it and then you will retain it.",
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a227d4f0ee3af6a19cacb996ce701913 | i am a re repeater...what will i do for crack meet 2018??? | askiitians.com | 2021.31 | [
{
"text": "hello student for cracking neet 2018, you need to learn in very systematic manner. practice as much as sample paper/previous year papers that you can. after learning every chapter practice 100 mcqs at least for every chapter. go for some detailed book as you have a good time to prepare. you can opt for coaching institute as well. contact us at these numbers 1800-2000-838 +91-120-4616500 we will provide you more information as well which will make you see things more clearly. don’t hesitate to call.",
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"text": "intense self study is the best way to prepare for neet exam and always be motivate by any thing that is enough.",
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4304ca28628f1a2700bc044dccf52b40 | sir, which is better option? cse(duel) kharagpur or cse 4yr guwahati | askiitians.com | 2021.21 | [
{
"text": "cse dual at iit kharagpur is better than cse at iit guwahti. you would get lots of research & job opportunity, extracircular activities at kharagpur. i would suggest you to take cse dual at kharagpur. good luck! thanks & regards jitender singh iit delhi askiitians faculty",
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a62eb5d9d8d1e248cc12341d0017f5a5 | sir please rank the following colleges on overall attributes as of today 1)iit guwahati 2)nit warangal 3)iit hyderabad 4)iiit hyderabad | askiitians.com | 2021.21 | [
{
"text": "1...iit guwahati 2...nit warangal 3...iit hyderabad",
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4b47d67119367b8c938885f2aad7ff39 | correct answers are option 1 and 3. please show how to convert option 3 into option 1. | askiitians.com | 2021.21 | [
{
"text": "square the full expression of option 3 and simplify then take its square root",
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27cf65e3763a78b4380b3db88d7b404b | i want to become scientist in astrophysics , and right now i am doing polytechnic with trade digital electronics ,what should i do next to pursue my career in astrophysics as a scientist. | askiitians.com | 2021.21 | [
{
"text": "sir, please help me and give answer to the question above,please ,please.",
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ee0c8e8b835935e4e3f80a7143eafa76 | in general relativity, mass did einstein mean i.e. gravitational or inertial mass? in the equation. g mu.nu=8.pi.t/c^4 *t mu nu | askiitians.com | 2021.25 | [
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"text": "dear student please write language properly as i am unable to u derstand. please you can attach an image too of the question. i will be happy to help you. regards arun",
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c9b10cc528b9e201a1a75bcfeedbeba1 | if cos^4a-sin^4a=x, find cos^6a-sin^6a in terms of x | askiitians.com | 2021.25 | [
{
"text": "cos^4 a - sin^4 a = x = (cos^2 a)^2 - (sin^2 a)^2 = (cos^2 a + sin^2 a)(cos^2 a - sin^2 a) = x ==> cos^2 a - sin^2 a = x cos^6 a - sin^6 a = (cos^2 a)^3 - (sin^2 a)^3 = (cos^2 a - sin^2 a)(cos^4 a + sin^4 a + sin^2 a. cos^2 a) = x . ( 1 + sin^2 a .cos^2 a) = x + x.sin^2 a.cos^2 a please approve !",
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"text": "cos 4 a-sin 4 a = (cos 2 a+sin 2 a)(cos 2 a-sin 2 a) = x = (cos 2 a-sin 2 a) = x (cos 2 a-sin 2 a = cos2a) cos2a = x ..........1 sin2a = (1-x 2 ) 1/2 ............2 we have to find the value of cos 6 a - sin 6 a = p p = cos 6 a - sin 6 a =(cos 2 a+sin 2 a)(cos 4 a + sin 4 a-cosasina) =(sin 4 a+cos 4 a-cosasina) = [ 1 + cos 2 2a -sin2a]/2 = [ 1+ x 2 - (1-x 2 ) 1/2 ]/2 this is the value of expression",
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722c4e9a1ba121de3f5701ed2211a8d2 | please answer this question in the given image of finding equivalent resistance | askiitians.com | 2021.25 | [
{
"text": "if you join battery between p and there will be no current on resitance having one terimal either at q or s. so therewill be 3 10 ohm resistance in series having equivalent 30 ohm. which will be parallel with 10 ohm having equivalent resistance 15/2 ohm, ehich will be in series with two resistance of qo ohm. so equivalent resistance will be 55/2 = 27.5 ohm.",
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c1d1b8e99108e41b87f96437d1dd6b20 | sir i am frm rajasthan i have given aieee 2009 and after viewing solutions by various institute i am getting around 210 marks i want it br. in any nit can u please tell me which nit can i get or which is the best option for me in any nit pls help me, i m in a great confusion. | askiitians.com | 2021.31 | [
{
"text": "dear gaurav, with a total of 210 in aieee your expected rank is 10,000. now with this rank you may get computer science or it in nit jaipur and nit patna.",
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55f43e8e0c55089c8efd40cee4379a3b | all reagents for different processes in organic chemistry | askiitians.com | 2021.25 | [
{
"text": "want you want to ask is not clear.",
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}
] |
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fd0562831155b90e4ca3f0d852fdbe75 | which is better- electrical in iit roorkee or computer in iit guwahati? interest doesnot matter. | askiitians.com | 2021.43 | [
{
"text": "iit roorkee electrical",
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},
{
"text": "take computer in iit guwahati,,as per earlier students and job placements u will have better option in iit ghy u will have wonderful carrer....................u should take it and u will have wonderful job opurtunities plzz appprove my answer plzzzzzzzzzzzzzzzzzzzz",
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},
{
"text": "iit guwahahti cse is far more better than iit roorkee elec .since the companies visiting iitg fr cse are very good..and iitg has reprtedly given highest number of placements in firm like google.... so blindly go fr iitg",
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de8f28aac7b03927befb62121d8944d7 | what is meant by the chelate effect? give an example. | askiitians.com | 2021.43 | [
{
"text": "when a ligand attaches to a metal ion in a manner that forms a ring then the metal ligand association is found to be more stable. forex-[ni(nh3)6]+2 [ni(en)3]+2 second is more stable than first because it forms a chelte complex",
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99d2aab72cfb3d5eca81314783a03612 | why we use polar aprotic solvents for sn2 reactions and polar protic solvents for sn1 reactions ? | askiitians.com | 2021.43 | [
{
"text": "because carbocation is formed in sn1 hence we need a solvent which provides h+ . hit approve if u got even a little help by my answer :) thanks .",
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] |
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0f30c37907e371c57a82391755ef4c9a | i am ritesh arora i am a iitian i want a online course for data analysis | askiitians.com | 2021.25 | [
{
"text": "hello you can search on udemy for courses in the field of data analysis. for every course in udemy, there is a small certificate fees of around rs 300-500 but if you don’t want completion certificate,then you can still study online absolutely free.in any case, you can still wait for the fees to come down. i have personally completed 3 courses on udemy and found it authentic and i have been able to directly connect with the course tutor over linkedin and mail id.",
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051fc9f5b4ea55299cf54177630c4e55 | light enters train air to glass having refractive index 1.50. what is the speed of light in the glass? the speed ref light in vacuum is 3 × 10 8 m/s. | askiitians.com | 2021.39 | [
{
"text": "dear student the speed of light in vacuum is = 3 × 108m/s refractive index of glass n = 1.50 n = c / v speed of light in glass, v = c / n v = 2 * 10^8 m/s thanks",
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fb6351a9346b8b1c201aeb6968cdee49 | solve the following equations: 5t + 28 = 10 …......... | askiitians.com | 2021.25 | [
{
"text": "dear student by transposing 28 from lhs to rhs it becomes -28 then, = 5t = 10–28 = 5t = - 18 now, divide both side by 5, = 5t/5= -18/5 = t = -18/5 thanks",
"name": "",
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{
"text": "dear student, we can solve this question as follows : 5t + 28 = 10 5t = 10 - 28 5t = -18 t = -18/5 hope it helps! thank you ✌️",
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7dafbf731f93b77b8f8ecfa85b6e7cb1 | here ø 0 is constant answer is pi*sin(n*ø 0 ) / sinø 0 | askiitians.com | 2021.31 | [
{
"text": "dear student there is no phi , in the attached image , please post the correct question , we will help good luck",
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2e3f77c6ff3abed6f03e525e89ed56b2 | sum of reciprocal of factorials | askiitians.com | 2021.25 | [
{
"text": "when n is very large then sum of factorials = e-1 for deep knowledge http://math.stackexchange.com/questions/287946/sum-of-reciprocals-of-factorials",
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d1176012761aee6a9851071b4f352175 | x gm a atoms on combining with y atoms of b form 5 molecules of a compound containing a & b. find the molecular weight of compound formed. (atomic weight of b = m) | askiitians.com | 2021.39 | [
{
"text": "we have been given a and b combines to form together 5 molecules of ab. the reaction is supposed to occur as; a+yb→5ab we can find the molecular weight of compound ab as; weight of a+weight of y atoms of b=weight of 5 molecules ab -----------(1) weight of a= x gram (given) weight of b=m gram (given) since there are y atoms of b , so therefore the weight of y atoms of b=ym gram let suppose weight of ab= w gram since, there are five molecules of ab formed, therefore, weight of 5 molecules of ab=5w now put all , these values in equation (1), we get; x+ym=5w w=(x+ym)/5 grams thus, when x gm a atoms combine with y atoms of b to form 5 molecules of a compound containing a and b, then the molecular weight of the compound is (x+my)/5.",
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f8d540ade3a7e91f1217c47884b05cdb | size of gallium is less than aluminium due to d-orbitals,but why so? | askiitians.com | 2021.31 | [
{
"text": "hi ranjita, the atomic radius of the ga is less than al because of poor screening effect. the atomic radius of ga is slightly lesser than of al because in going from al to ga, the electrons have already occupied 3d sub shell in ga. the screening effect of these intervening electrons being poor, has less influence to decrease the effective nuclear charge, therefore the electrons in ga experience more forces of attractions towards nucleus to result in lower size of ga than al. regards, ashwin (iit madras).",
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"text": "the shielding effect of d-orbitals is very poor due to it’s diffused-spreading-shape in case of gallium. the d-orbital have diffused nature and thus poor shielding-effect.the shielding is just reducing impact of effective positive nuclear charge on the outer most electrons. the position of gallium is just immediately after zn which has completly filled d-orbitals ( 10 electrons). this makes the pronunced effect of nuclear charge (zeff) and we find reduction in atomic radius of gallium. it is thus diffused d-orbitals and their inability to shield the strong +ve charge which changes the trend of atomic radius. the ga at. radius is thus unexpectedly smaller than al and change in trend of periodic table set-up.",
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{
"text": "because the replusions b/w valence electrons and lower sub shell electrons are quite less than that of attraction between valence electrons and nucleus (in ga). but in al this phonomenon is just neglected.",
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{
"text": "dear student the atomic radius of the ga is less than al because of poor screening effect. the atomic radius of ga is slightly lesser than of al because in going from al to ga, the electrons have already occupied 3d sub shell in ga. the screening effect of these intervening electrons being poor, has less influence to decrease the effective nuclear charge, therefore the electrons in ga experience more forces of attractions towards nucleus to result in lower size of ga than al. i hope this answer will help you. thanks & regards yash chourasiya",
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bedfa23abb7cc9f38c74283b45faa378 | is b.tech in software engineering beneficial and does it hold good placement prospects? | askiitians.com | 2021.25 | [
{
"text": "b.tech software engineering is a good option and have very better future prospects for talented persons.. but as far as placements are concerned can u tell me in which college u r getting software engineering??? r u talking abt dtu which is offering software engineering from this academic session.. dtu have very good placements, but the placements were poor this year due to recession and will be good in future. if u have interest in software engineering then u must go for this course..",
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2c6b3cc037e272f2bf92884e1cc578a4 | string is tied b/w points x=0 and x=l it vibrates in fundamental mode .mass per unit length is given to be μ.tension in the string is t and amplitude is a. find the energy of the string. ans--a 2 tπ 2 /4l | askiitians.com | 2021.43 | [
{
"text": "dear student you have to integrate 1/2uxdx/l from 0 to a you will get the answer a2ua2/4l please feel free to ask your queries here. we are all iitians and here to help you in your iit jee preparation. all the best. win exciting gifts by answering the questions on discussion forum. so help discuss any query on askiitians forum and become an elite expert league askiitian. now you score 5+15 points by uploading your pic and downloading the askiitians toolbar respectively : click here to download the toolbar.. askiitians expert sagar singh b.tech, iit delhi",
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21830059d313f111acc4385ba97eedbd | the notation for entropy is ds=dq/t. it makes sense to call it a state function as fot a cyclic process integral of dq/t=0. but how do we correlate it with randomness of system? i mean randomness is a totally different thing - a particle having a probability of going in just any direction is randomness. how do we know if heat supplied is dq & temperature is t increase in randomness =dq/t? | askiitians.com | 2021.31 | [
{
"text": "entropy:- it''s a disorderness of a system.during time change every non living thing looses it''s information for example by let to itself a sand house buld near a sea by a child will be dimnished as time goes on means it loosing it''s information(dimension,shape..etc). so in physics disorderness termed as entropy.entropy is nothing but a probability of a partical to be in a state. heat is an external disordeness. a non living body like heat engine loss it''s information in the form of heat",
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8f5b621365edf265fe65ac331b793bd3 | if a capacitor is placed across a 20 v source, what will be the amount of charge after 5 tc? 13.5 v 5.0 v 20 v 12.8 v | askiitians.com | 2021.43 | [
{
"text": "dear abhishek voltage = 20 v. so, the amount of charge after 5tc= vin * (1-e^(-t/rc)) = 20*0.993 =19.86 and its app. = 20 v. hence option c is correct. regards arun (askiitians forum expert)",
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] |
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88b0ed2384987937997bbb7a6e6f3616 | electric field at a point at distance r(>r) from uniformly charged cylinder.. | askiitians.com | 2021.21 | [
{
"text": "hey listen!! u have take a gaussian surface! like as cylinder nd that point must be on the curved surface path of gaussian surface.then,u found that direction of both area vector nd electric field is 0° so,now use gauss law formula nd get the answer! 👍👍👍 if any doubt then ask!! hope u understand! how to solve it..",
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a5a0494f193292c3e45415eb95ac5a55 | 33. helium atom has 2 electrons in its valence shell but its valency is not 2. explain. | askiitians.com | 2021.43 | [
{
"text": "helium atom has only two atoms in k-shell. k-shell is already complete. it can neither lose nor gain electron. so, its valency is zero.",
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d26d051295c237087eba51a60055a0ec | sir i am in class 12 but i am not confident about getting selected in iit-jee 2010 so i want to drop a year for preparation and i am very sure that i can crack jee in my second attempt.but dropping one year can affect my career | askiitians.com | 2021.31 | [
{
"text": "dear prasanjeet, if you are very keen in getting to iit's and also if you are confident,i will suggest you to drop an year, because it will be worth it. but it is a risk you are going to take. see , how you perform the other exams like, bitsat, aieee and if you are able to get a good branch in reputed college now itself, then i would not advise to waste another year. but it's your choice that is going to matter. please feel free to post as many doubts on our discussion forum as you can. if you find any question difficult to understand - post it here and we will get you the answer and detailed solution very quickly. we are all iitians and here to help you in your iit jee preparation. all the best prasanjeet !!! regards, askiitians experts rohith gandhi p",
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898f9377d8e6fc2c46c95aba66456563 | the work done on the gas in taking it from d to a is? | askiitians.com | 2021.21 | [
{
"text": "dear student please attach the image of the question regards",
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},
{
"text": "dear student question is not clear please attach an image, we will happy to help you good luck cheers",
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219db2d38843e26074f8d2019761d8e9 | if the point (1,2) and (3,4)were to be opposite side of line3x-7y+a=0 then 7＜a＜11 a=11 a=7 a＜7 or a＞11 | askiitians.com | 2021.31 | [
{
"text": "l1 l2 <0 (3-14+a)(9-28+a) <0 (a-11)(a-19)<0 11<a<19 i guess there is some error in the point you have given , check it again method is same",
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] |
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71021e5291ee56b2d1353e4c354ec3d0 | if the m.i of a disc about an axis tangential and parallel to its surface is i, then its m.i about the axis tangential but perpendicular to the surface is | askiitians.com | 2021.31 | [
{
"text": "dear gautham, moment of inertia (mass moment of inertia) - i - is a measure of an object''s resistance to changes in rotation direction. moment of inertia has the same relationship to angular acceleration as mass has to linear acceleration. for a point mass the moment of inertia is the mass times the square of perpendicular distance to the rotation reference axis and can be expressed as i = m r 2 (1) where i = moment of inertia (lb m ft 2 , kg m 2 ) m = mass (lb m , kg) r = distance between axis and rotation mass (ft, m) that point mass relationship are basis for all other moments of inertia since any object can be built up from a collection of point masses. i = ∑ i m i r i 2 = m 1 r 1 2 + m 2 r 2 2 + ..... + m n r n 2 (2) for rigid bodies with continuous distribution of adjacent particles, the formula is better expressed as an integral i = ∫ r 2 dm (2b) where dm = mass of an infinitesimally small part of the body cracking iit just got more exciting,it s not just all about getting assistance from iitians, alongside target achievement and rewards play an important role. askiitians has it all for you, wherein you get assistance only from iitians for your preparation and win by answering queries in the discussion forums. reward points 5 + 15 for all those who upload their pic and download the askiitians toolbar, just a simple to download the toolbar…. so start the brain storming…. become a leader with elite expert league askiitians thanks aman bansal askiitian expert",
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cf3b8c6d579dccc18f1ee26874b4fbad | if sec (a+b),sec a, sec (a-b) are in a.p. then the value of cosa secb/2 | askiitians.com | 2021.21 | [
{
"text": "ans: hello student, please find answer to your question below sec(a+b), seca, sec(a-b) are in ap, we have",
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] |
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eca81ce3dfdf82a754150cc1ef744b5c | sir i belong to sc category and i expect 328 marks in neet-1 . should i try for neet-2 | askiitians.com | 2021.39 | [
{
"text": "hi, i donno if you will be able to get because you are not eligible i suggest you enroll yourself for some rigorous coaching and try for neet-2. thank you, best of luck jehoyesjira",
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] |
|
4345c91d74ebabac7e0ecf4ca991f11b | in a 7*11 chessboard find the probability that a rectangle picked up has odd area ?? | askiitians.com | 2021.25 | [
{
"text": "dear student the area can be odd number when both length and breadth are odd number ie out of {1,2,3,4,5,6,7} and {1,2,3,4,5,6,7,8,9,10,11} possible combinations are {1,3,5,7} and {1,3,5,7,9,11} ie ((4*6)/ (7*11)) regards",
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d0b29ca19c5493ce54546cfb020dea87 | w(angular velocity) has a direction either in or out of the plane .y z it not a vector.y cant we use triangle law of vector addition 4 it? | askiitians.com | 2021.25 | [
{
"text": "angular velocity is a vector quantity w = w0 +alpha*t. all these type of equations are valid for vectors only",
"name": "",
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},
{
"text": "dear student, no you cant use triangle law of vector addition for it.. best of luck..!!!! we are all iitians and here to help you in your iit jee preparation. win exciting gifts by answering the questions on discussion forum. so help discuss any query on askiitians forum and become an elite expert league askiitian. now you score 5+15 points by uploading your pic and downloading the askiitians toolbar : click here to download the toolbar.. askiitians expert sagar singh - iit delhi",
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b95ac8c27c24fab6ba3e7460cde4bd7c | if a wire of uniform cross section is stretched such that ,its length is increased by 2%,50%then the %change in its resistance is\_\_\_ 1)4%,100% 2)1%,25% 3)4%,125% 4)4%,50% | askiitians.com | 2021.39 | [
{
"text": "as nothing has been mentioned about area x length = constant we will follow the conventionas: resistance is directly proprtional to square of length of resistance wire. thus r = kl^2.........................(1) after stretching, l becomes = >0.02l + l = 1.02l therfore r’ = k(1.02l)^2.....................(2) divide the eqns. (1) and (2) r/r’ = 1/(1.02)^2 simlarly do it for 50%.",
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cac3117d0e72691b08bf0e6a6913c554 | 9. if the 3rd and the 9th terms of an a.p. are 4 and − 8 respectively. which term of this a.p. is zero. | askiitians.com | 2021.39 | [
{
"text": "given that, 3rd term, a3 = 4 and 9th term, a9 = −8 we know that, an = a+(n−1)d therefore, a3 = a+(3−1)d 4 = a+2d ……………………………………… (i) a9 = a+(9−1)d −8 = a+8d ………………………………………………… (ii) on subtracting equation (i) from (ii), we will get here, −12 = 6d d = −2 from equation (i), we can write, 4 = a+2(−2) 4 = a−4 a = 8 let nth term of this a.p. be zero. an = a+(n−1)d 0 = 8+(n−1)(−2) 0 = 8−2n+2 2n = 10 n = 5 hence, 5th term of this a.p. is 0.",
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ff071c2ce963e908063adb7629355449 | sir........my rank in iit jee 2011 is 8725..can i get a seat in any of the iit's no matter what branch i get?..........considering that dere are 9618 seats in total.........and i belong to the general category! | askiitians.com | 2021.31 | [
{
"text": "see the opening & closing ranks of the previous years.. most probably u can get ocean & naval architecture at kgp..",
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2bca47e3fece19dba9765a7016961ab7 | i'm sorry i have to ask this question again but... my expected marks in jee 2011 are 230-238, will i get into atleast the new iits... i have to ask it again as the previous ans was very affirmative but several websites predict my rank to be 5000-6000... is it reliable?? | askiitians.com | 2021.21 | [
{
"text": "i guess not, as whosoever told you about your rank status is in my opinion a bit too far from what you'd get in real as your most prospective rank which would be in between around 2500-3500 for sure.",
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7dc235b699e1ed344a194ffee01199b0 | my obc rank is 378 can i get iit delhi or iit kanpur mechanical? | askiitians.com | 2021.21 | [
{
"text": "i hope the query is resolved",
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c34d24c8475b6a1236b04561b1e77f4e | why electron cant exist in nucleus with explanation | askiitians.com | 2021.31 | [
{
"text": "dear baba on the basis of heisenberg's uncertainty principle, it can be shown as to why electron cannot exist within the atomic nucleus. the radius of the atomic nucleus is of the order of 10 - 1 5 m. now, if the electron were to exist within the nucleus, then the maximum uncertainty in its position would have been 10 - 1 5 m. mass of electron, m = 9.1 x 10 - 3 1 kg, d x =1 x 10 - 1 5 m. the value of uncertainty in velocity, d v is much higher than the velocity of light (3.0 x 10 8 ms - 1 ) and therefore, it is not possible. hence an electron cannot be found within the atomic nucleus. all the best akash goyal askiitiansexpert-iitd please feel free to post as many doubts on our discussion forum as you can. we are all iitians and here to help you in your iit jee preparation. now you can win exciting gifts by answering the questions on discussion forum. so help discuss any query on askiitians forum and become an elite expert league askiitian.",
"name": "",
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{
"text": "hi garg because if you consider the electron in nucleus it will be the thomsons model and this model cannot explain the stability of atom and also the advantages of bohr's model",
"name": "",
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{
"text": "well the maximum energy of emission of em waves from the atom(like beta rays) is 7mev.if the electron were to exist in the nucleus,then the energy of the electron would become around 20mev,which means that the energy of the emission show be higher.so electrons can’t exist in nucleus,all this data is experimental.",
"name": "",
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{
"text": "let us assume that an electron can exist inside the nucleus. then the total spin of the nucleus will be half integral if there are three fermioms can exist inside the nucleus. for example,consider the deuteron(nucleus of deuterium)having one proton,one neutron and and electron,then total spin of the nucleus is 3/2(1/2+1/2+1/2=3/2). but experiments shows that spin of the deuteron nucleus is +1.hence only two fermions can exist inside the nucleus in deuteron. #no electron can exist inside the nucleus#",
"name": "",
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{
"text": "hello student one anology for this can be if electron were to exist inside nucleus they will get annihilated very quickly due to the presence of positively charged proton to form a neutron, and thus the elctrons wouldn’t be able to exist freely as we know it for long duration of time along with the existence of protons around us. another method could be used to neumerically prove the same on the basis of heisenberg’s uncertainity principle. as we know atomic nucleus is of the order 10 -15 m for an electron to exist inside nucleus its uncertainity in position should be -15 m nom mass of electrom = 9.1 x 10 -31 kg hence, by heisenberg uncertainity principle δx.δp >= h/4π v >= h/(4πδx.m) = 6.626 x 10 -34 / ( 4 x 3.14 x 10 -15 x 9.1 x 10 -31 ) = 5.79 x 10 10 m/s hence the uncertainity in its velocity will be 5.79 x 10 10 m/s which is very much greater than even the speed of light and as we know nothing in this universe travels faster than light, it is impossible for an electron to have this much uncertainity in its velocity. hence, our assumption that electron exist inside the nucleus must be wrong. hope it helps regards, kushagra",
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|
875b1a3a47f0e278a300955953d66efe | altsm 22/03 q115 | askiitians.com | 2021.25 | [
{
"text": "i think the answer is 10 mv.",
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}
] |
|
f56c3f6d4473447ca02e148beeeaf034 | cot3a=? | askiitians.com | 2021.31 | [
{
"text": "hint: replace cota by 1/tana and then use the formula for tan3a. thanks.",
"name": "",
"is_accepted": false
},
{
"text": "hint: replace cota by 1/tana and then use the formula for tan3a. thanks.",
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] |
|
072270862b62ae919a898e0b0e7cbc61 | the area bounded by the straight lines x=0 , x=2 and the curve y =2 x , y= 2x-x 2 is (a)4/3 -1/log2 (b) 3/log2 + 4/3 (c)4/ log2 -1 (d) 3/ log2 - 4/3 | askiitians.com | 2021.39 | [
{
"text": "coloured area to be found out area = int (2 x ) frm (0,2) - int (2x -x 2 ) frm (0,2) = [2 x /log2 - x 2 + x 3 /3] = (9 - 4 log2)/log8 -- ramesh",
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] |
|
4af7b80bcded673e9b4c1ec71b0a037b | hi, how is iiit allahabad, is it good to study it in it or any branch in nit | askiitians.com | 2021.43 | [
{
"text": "dear student, it at iiit allahbad is really good , go for it, best of luck...!!!! cracking iit just got more exciting,it’s not just all about getting assistance from iitians, alongside target achievement and rewards play an important role. askiitians has it all for you, wherein you get assistance only from iitians for your preparation and win exciting gifts by answering queries in the discussion forums. reward points 5 + 15 for all those who upload their pic and download the askiitians toolbar, just a simple click here to download the toolbar…. so start the brain storming…. become a leader with elite expert league askiitians thanks aman bansal askiitian expert",
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c1efc89d30aa2de52483943355b8da48 | sir i want to take a one year correspondense course for jee,so if i take two coaching centres study material then will it be a good idea?? or one coaching centre's study material will be enough?? | askiitians.com | 2021.25 | [
{
"text": "dear abhishek just take material of one coaching and follow text books of arihant all the best. akash goyal askiitiansexpert-iitd please feel free to post as many doubts on our discussion forum as you can. we are all iitians and here to help you in your iit jee preparation. win exciting gifts by answering the questions on discussion forum. so help discuss any query on askiitians forum and become an elite expert league askiitian. now you score 5+15 points by uploading your pic and downloading the askiitians toolbar respectively : click here to download the toolbar..",
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81d66289f5201696b5de4c49ac61515d | f(x)=log(x+(x 2 +1) 1/2 ) is (a) even function (b) odd fubction (c)periodic function (d)neither even nor odd function explain ur answer pls. | askiitians.com | 2021.21 | [
{
"text": "hi aditi, note that √(x 2 +1) - x = 1/[√(x 2 +1) + x] hence log(√(x 2 +1) - x) = -log[√(x 2 +1) + x] hence f(-x) = -f(x). hence f(x) is odd. hope that helps. best regards, ashwin (iit madras).",
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] |
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4aed9cac63b9a352f65dd17f608cf14d | can somebody please help me solve this question. i was thinking that would it be possible to answer this question using formula b=mv/qr. thank you. | askiitians.com | 2021.43 | [
{
"text": "as b = mv/qr m = 9.1*10 -31 kg q = 1.6*10 -19 c v = 5*10 5 m/s r = 5*10 -11 m so b = 5.7*10 4 t hope it clears.",
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] |
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959cb775192df6fefe43950b47cb0be2 | i have passed the icse exam 2009 with 96% marks overall including 97% marks in physics and maths. and planning to crack iitjee 2011. what are my chances to crack the exam/ how should i prepare? what tutorial to join? is akash-iitjee good ? | askiitians.com | 2021.31 | [
{
"text": "first of congratulation for this score in icse. i think u only have the answer for ur question. constant hard work with dedication and passion to crack jee is the only way. be systematic in ur studies. if u r done with this, then no one can stop ur way to iit. u can go for fiitjee, brilliants, resonance if u going for class programme. i can't comment on akash as its new in iit field. wish u good luck for jee.",
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},
{
"text": "to sunil sir, i have not understood the chapter friction well.i will be very grateful if u could explain it to me. yours faithfully ramsing pal",
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},
{
"text": "hi, you can click the link : http://www.askiitians.com/iit-jee-physics/mechanics/friction.aspx hope you will not find any problem in friction area. please feel free to post as many doubts on our disucssion forum as you can. if you find any question difficult to understand - post it here and we will get you the answer and detailed solution very quickly. we are all iitians and here to help you in your iit jee preparation. all the best . regards, askiitians experts",
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|
c938a68b095c19e6fa4318e2e414d4e6 | calculate the molecular masses of nh 3 ebewygevcehwhfe | askiitians.com | 2021.43 | [
{
"text": "dear student nh3→ (1 × 14) + (3 × 1) = 17 u thanks",
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}
] |
|
3af323d0cc6e3093779ef35aa790cfa6 | the number of positive divisors of the form 4n+1 of the number 25*3^11*10^10 isa.220 b.264 c.78 d.22 | askiitians.com | 2021.43 | [
{
"text": "dude rite ques properly with braces.......",
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] |
|
33f2aa0b09e22409df3ed91595d6a525 | hi i want good books of class 11 for iit jee preparation | askiitians.com | 2021.39 | [
{
"text": "hello.i just want to sy that for iit jee preparation good books for physics are hc verma,dc pandey ,d mukherjee and you may have the option to make books like hallidayfor chemistry i think you should go for rc mukherjee,n avasthi and ncert because now jee mains pattern is based on ncert for maths you should opt for sl loney pleasw kindly approved my answer",
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|
2abaca8e27fe7dc1c8fa06aeb96aecaf | modern phys include what all i need to abt number of questions asked for phys and chem chapterwise | askiitians.com | 2021.31 | [
{
"text": "dear student, modern physics has following parts- 1. atomic physics- the bohr model and different transition series in hydrogen-like atoms. 2. nuclear physics- structure, classification of nuclei, mass-energy equivalence, mass defect and binding energy, nuclear reactions, fission and fusion, 3. radioactivity- law of radioactive decay",
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|
63923917b8edba4a0c203e9bc580bd72 | why the directon of current is considered as opposite to the directon of flow of free electrons | askiitians.com | 2021.21 | [
{
"text": "the current which we generally talk about is known as conventional current .and this current is due to the flow of positive charges.thus its direction is opposite to that of the flow of electrons which constitutes electronic current .plz approve if understood .",
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477772f2bacbc88c7f06d74a8aae9321 | (x+1)4 /x4-x3+x2-x+1 | askiitians.com | 2021.25 | [
{
"text": "dear sukraat, thanks for posting your question to askiitians.com. askiitians gives you most reliable and efficient answers. your current question is not very clear and i am unable to understand it. please post it again and we will provide you good soltuions within a few hours. regards, arushi",
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513bc7ff0313b21f628fb4a391034144 | there are four women p, q, r, s and five men v, w, x, y, z in a group. we are required to form pairs each consisting of one women and one man. p is not to be paired with z and y must necessarily be paired with someone. in how many ways can four such pairs be formed. | askiitians.com | 2021.25 | [
{
"text": "dear student first fix y with every men p,q,r,s now there wil be 4 case with each man 1)p with y for qrs => 4*3*2=24 2)q with y for prs => 3*3*2=18 3)r with y for pqs => 3*3*2=18 4)s with y for pqr => 3*3*2=18 total = 78 hope this helps",
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] |
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f384961df57d282229f124542e81d819 | 1. exactly 0.200 mole electrons is passed through two electrolytic cells in series. one contains silver ion, and the other, zinc ion .assume that the only cathode reaction in each cell is the reduction of the ion to the metal. how many grams of each metal will be deposited? (at. mass of zn = 65, ag = 108) a. 108g ag and 65 g zn. b. 108 ag and 32.5g zn. c. 21.6 ag and 6.5 g zn. d. 21.6 g ag and 13 g zn. 2. a steady current of 30.0a for 70.2 min corresponds to a passage of a. 1.26 10^5 electrons. b. 1.26×10^5 f. c. 1.31 f. d. 1.31 c. 3. cu+ is not stable and undergoes disproportion. e for cu+ disproportionation. (e ° cu2+/cu =0.153v , e ° cu+/cu=0.53v). | askiitians.com | 2021.39 | [
{
"text": "hi ans 1: for silver , the conversion is ag + + e - -> ag therefore 1 mole of electrons are reqd to make 1 mole i.e 108 gm of silver. hence .2 moles of electron will make .2x108 = 21.6 gm of silver. for zinc, the connversion is zn 2+ + 2e - -> zn therefore 2 moles of elctrons are reqd to make 1 mole i.e 65 gm of zinc, hence .2 mole electrons shall make .2x65/2 = 6.5 gm of zinc.",
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{
"text": "hi ans 2: for a steady flow, the current i in amperes can be calculated with the following equation: where q is the electric charge in coulombs transferred t is the time in seconds more generally, electric current can be represented as the time rate of change of charge, or . therefore, q= 30 a x 70.2 x 60 sec = 126360 coulombs 1 faraday = 96 485.3415 coulombs therefore answer is 126360/96485.3415 = 1.31 faraday",
"name": "",
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{
"text": "hi please repost the third question, the question is not clear.",
"name": "",
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{
"text": "1) for silver deposition : ag + + e - ------> ag 1 mole 1 mole so , 0.2 moles of ag is deposited i.e., 0.2*108 = 21.6 grams for zinc deposition : zn 2+ + 2e - ------> zn 2 mole 1 mole so , 0.1 moles of zn is deposited i.e., 0.1*65 = 6.5 grams so option is c 2) electric current is the rate of charge flow past a given point in an electric circuit, measured in coulombs/second which is named amperes so q = i*t q=30*70.2*60 q = 126360 coulombs but 1 faraday = 96485 coulombs so its q = 1.31 faraday so option is c 3) i want to make a small correction to question reg. elecric potential of cu 2+ /cu + ( taken frm standard books ) its cu 2+ /cu + =0.153v i.e., cu 2+ + e - ------> cu + e0 = 0.153 v now going into problem: cu+ solutions, tend to give a disproportion reaction: 2cu + ----- > cu + cu 2+ cu + + e- ------> cu e0 = 0.53 v so, ne 0 = 0.53 v cu + ------> cu 2+ + e - e0 = - 0.153 v so, ne 0 = - 0.153 v on adding above rxns we get 2cu + ----- > cu + cu 2+ with e 0 = +0.377 v",
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] |
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9ff4bd0cf10e6ec0454cdbdb367042ea | when a ball thrown verically up from a height reaches the ground, is the final velocity = 0?? | askiitians.com | 2021.31 | [
{
"text": "yes, when a ball thrown verically up from a height reaches the ground, the final velocity is zero. after reaching the ground the velocity becomes zero. that is the final velocity of the ball.",
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}
] |
|
1a5c3330e39bc4d98a2033a9abe05cc4 | the maximum speed of the particle will change by a factor of | askiitians.com | 2021.39 | [
{
"text": "dear student question is incomplete. please check amd repost the question. you can also attach an image. i will be happy to help you.",
"name": "",
"is_accepted": false
}
] |
|
d65f946af8751ddf9e49d26ec5ad4ed9 | if a graph is plotted by taking spectral emissive power along y axis and wavelength along x axis then the area below the graph above wavelength gives what and how? | askiitians.com | 2021.39 | [
{
"text": "tot",
"name": "",
"is_accepted": false
}
] |
|
7d57891adfcf9863b7533e65bbb81942 | two identical balls each having mass density ρ 1 mass m and charge q are suspended from a common point by two insulating massless strings of angle θ with the vertical. now both the ball are immersed in a liquid.at equilibrium, θ remain same. if the mass density of liquid is σ then dielectric constant of liquid will be | askiitians.com | 2021.21 | [
{
"text": "two identical balls each having mass density ρ 1 mass m and charge q are suspended from a common point by two insulating massless strings of angle θ with the vertical. now both the ball are immersed in a liquid.at equilibrium, θ remain same. if the mass density of liquid is σ then dielectric constant of liquid will be",
"name": "",
"is_accepted": false
}
] |
|
1d72e72eec94e01e71c09805c9687e18 | is bit noida a good college in btech.if yes how much % they want in aieee | askiitians.com | 2021.21 | [
{
"text": "hi , bits noida is the extension of bits ranchi .. it don provides the btech course.. cehck out the courses list it provides : http://www.bitmesra.ac.in/cms.aspx?this=10&mid=494 please feel free to post as many doubts on our disucssion forum as you can. if you find any question difficult to understand - post it here and we will get you the answer and detailed solution very quickly. we are all iitians and here to help you in your iit jee preparation. all the best.",
"name": "",
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] |
|
34235940eb6102475a4ad4049386dfce | the inventor of triangle formed by the lines x+y=1, x=1, y=1 | askiitians.com | 2021.25 | [
{
"text": "dear student i didn't get the term inventor. please elaborate this. you can also attach an image. i will be happy to help you",
"name": "",
"is_accepted": false
},
{
"text": "what do you mean by invertor of triangle please ask a valid question nbest wishes,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,",
"name": "",
"is_accepted": false
},
{
"text": "dear student incenter of the triangle is given by the formula, i = (ax1 + bx2 + cx3 )/(a+b+c) , (ay1 + by2 + cy3 )/(a+b+c) the given lines, x = 1, y = 1 and x + y = 1 intersect each other at points a (1, 1), b (0, 1) and c (1, 0). we, have, a = bc = √2 b = ac = 1 c = ab = 1 therefore, the incenter is given by, i = (0.707, 0.707)",
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] |
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8e700f8774a281ee406669bd90ec43f3 | how to find coefficient of x^n in 1/(1-x)(1-2x)(1-3x) ans is ( 3^n+2-2^n+3+1)/2 sir pl explain the method | askiitians.com | 2021.43 | [
{
"text": "coefficient of x^n => multiply the above and check x^n",
"name": "",
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},
{
"text": "thanhs to ans but i think its not easy to observe how will we explain to find coefficient by multiplication to a student sir",
"name": "",
"is_accepted": false
},
{
"text": "in these kind of questions u can only multiply the coefficents , same kind of question came this year in iit advance paper 1,, integer type",
"name": "",
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] |
|
980205df59690ca1b63fab66903f3865 | sir,plz tell bca comes in which faculty? | askiitians.com | 2021.39 | [
{
"text": "plzz frame the question again are u asking abt bca-bachelor of computer applications... if so....it is a part of computer science enginnering .. whihc comes under faculty of enginnering in some universities and even sometimes in faculty of sciences too........ or bca9bridge connect act) is an exchange program with foreign universities.. -- regards ramesh",
"name": "",
"is_accepted": false
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] |
|
e14747bc5b62d2b68f1d7aba5b9c0ecf | which of the following ecological pyramid can both upright and invert? pyramid of number pyramid of biomass pyramid of energy both (1) & (2) | askiitians.com | 2021.43 | [
{
"text": "pyramid of number can also be inverted or upright. the following picture will help you understand this.",
"name": "",
"is_accepted": false
}
] |
|
280f0fdaa98109281f6ff34dde0f8730 | 20 bags of cement , of 40 kg , cost rs1800. find the cost of 15 bags of cement weighing 3 kg each. | askiitians.com | 2021.21 | [
{
"text": "dear sindhu 20 bafs 40 kg each total 20*40 = 800 kg thus 800 kg for 1800 rs now for 1 kg = 1800/800 = 2.25 rs now 15 bags 3 kg each total weight = 15*3 = 45 kg hence total cost = 45 * 2.25 = 101.25 rs regards arun (askiitians forum expert)",
"name": "",
"is_accepted": false
}
] |
|
7f841c26f25bac9177847a97fe212432 | please tell above answer quickly and as soon as possible | askiitians.com | 2021.25 | [
{
"text": "dear student please note that these three vectors form right angle triangle with two sides as a and b and hypotenuse a+b use simple trigonometryto solve regards",
"name": "",
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}
] |
|
4865e09a0f758e6f66e81d1e46210540 | please i need a detailed explanatino of ionic reactions from the very beging i do need a detailed explanation of redox reactions with examples | askiitians.com | 2021.21 | [
{
"text": "what exactly is your doubt? give a sample question and ill explain it (:",
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}
] |
|
3677d1d2fb64f6c4537e21b7aa96027e | which of the following is the wrong statement? (1) o3 molecule is bent (2) ozone is violet-black in solid state (3) ozone is diamagnetic gas (4) oncl and ono^ – are not isoelectronic | askiitians.com | 2021.43 | [
{
"text": "hi jayant sorry but all the options provided in your question are correct so dude no statement is wrong thanks:}",
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|
f41d554d7d1b316cca7c1d56364c2e9d | see the image i attached here & hlp me to solve the problem with best answer anyone can gave | askiitians.com | 2021.31 | [
{
"text": "first of all: restoring force= so we get : cx+ scx 2 =restoring force as x is wery small x 2 so x 2 can be neglected i.e scx 2 =0 now force= ma= cx so x/a=m/c now you can find required time period and frequency.",
"name": "",
"is_accepted": false
}
] |
|
da65e37671ba0c91bace0b9f235c4b21 | i am confused what to take iit bhu chem engineering and study for cse or take ism dhanbad cse | askiitians.com | 2021.43 | [
{
"text": "dear friend, bhu stand atop amongst so many reputed institutions, so, if you have got a chance to study there, then without any second opinion keep going there, else cse is also a good branch to pursue. ism dhanbad and certain other reputed institutions are also there in the queue which are doing a wonderful job in the fields of quality education and sound placements in reputed companies, so, if you are interested switch to any other place then you may go for any one out of these as well – ambalika institute of management and technology,lucknow,........................dpg institute of technology and management, gurgaon,.....................lovely professional university, phagwara,..........................jjtu, jhunjhunu",
"name": "",
"is_accepted": false
}
] |
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