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9 Mar 2009 12:29:18 IST
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I was thinking in competetive exams we have to appear for objective questions so why not start a thread only dealing with that. We should post questions how silly(least expected) or how difficult it may be. So lets start posting questions and those who know the answers should answer them with proper explanations. The questions should be numbered properly. Try to ask questions mostly from previous years papers. Who all like this thread start contributing. If this thread is a success we can copy the same in other forums too. So i am starting with question no.1 1. The correct structure of  is a) triagonal bipyramidal b)octahedral c)tetrahedral d)square bipyramidal
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9 Mar 2009 12:38:12 IST
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The answer to this is Trigonal bipyramidal.
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9 Mar 2009 12:43:23 IST
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Correct. 2.)Half life of radium is 1580 years. Its average life will be : a)1.832 * 10^3 years b)2.5*10^3 years c)2.275*10^3 years d) 8.825*10^3 years
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9 Mar 2009 13:04:23 IST
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i think answer is c
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9 Mar 2009 13:10:10 IST
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yes its c Avrg life= T(1/2) / .693
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9 Mar 2009 13:15:16 IST
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Correct 3.Which of the following does not possess a permanent dipole moment? a) b)  c) d) 
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9 Mar 2009 13:18:30 IST
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d) SO3
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9 Mar 2009 13:19:37 IST
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On drawing the structure the net dipole moment cancels out as the shape is planar and symmetric.
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9 Mar 2009 13:19:42 IST
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shud be so3
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9 Mar 2009 13:21:50 IST
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Yes ryt Sulphur is surrounded by three oxygen atoms with double bonds.. so net dipole moment cancels out
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9 Mar 2009 13:24:42 IST
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My turn - Q4. There is no S-S bond in : a) S2O32- b) S2O42- c) S2O52- d) S2O72-
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<TABLE CELLSPACING="1" CELLPADDING="1" BORDER="0">
<TR><TD>
<DIV ALIGN="right">Glitter Graphics</DIV></TD></TR></TABLE>
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9 Mar 2009 13:27:15 IST
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what about cs2
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9 Mar 2009 13:29:41 IST
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Well now that is weird 2 answers ??CS2 seems correct(Linear)But SO3 was also coming correct(Trigonal planar)
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9 Mar 2009 13:31:04 IST
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CS 2 has a Linear structure C is surrounded by two sulhur atoms with double bonds so net dipole moment is zero
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9 Mar 2009 13:33:18 IST
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d) s2O7 (2-)
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9 Mar 2009 13:35:07 IST
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Right.
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9 Mar 2009 13:44:24 IST
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Q5. Which of the following is not oxidised by O3 ? a) KI b) FeSO4 c) KMnO4 d) K2MnO4
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<TABLE CELLSPACING="1" CELLPADDING="1" BORDER="0">
<TR><TD>
<DIV ALIGN="right">Glitter Graphics</DIV></TD></TR></TABLE>
JEE is not for the regular cramming kinda people but is rather for the people who think about things to the core level and they are the ones who actually excel in life. |
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9 Mar 2009 13:51:05 IST
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C) KMNo4
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9 Mar 2009 13:52:17 IST
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5. c) KMnO4
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9 Mar 2009 13:52:22 IST
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It was really easy, you never needed to do the reactions, but just the oxidation number in KMnO4.
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