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IIT JEE 2009 Chemistry Paper2 Code 1 Solutions

17.    The total number of cyclic structural as well as stereo isomers possible for a compound with the molecular formulae C5H10 is

Sol.   7

        Below are the cyclic isomers of C5H10

        cyclic isomers

        For 3rd structure 2 cis-trans and 1 optical isomer are possible.

        Total 7 isomers

18.    The total number of a and b particles emitted in the nuclear reaction  

      238U92 --->  214Pb82

Sol.   8

         Below is the chain of reaction

                         -2α                        -2β

        92U238  ---------->  80X214  ---------->  82Pb214   (6a, 2b), total 8 particles

  19.    At 400 K, the root mean square (rms) speed of a gas X (molecular weight = 40) is equal to the most probable speed of gas Y at 60 K. The molecular weight of the gas Y is

Sol.   4

        Vrms(X gas)(400 K) = Vmp(Y gas)(60 K) 

        M.Q. (X gas) = 40; M.Q. (Y gas) = x 

        √(3RT1/M1 ) = √(2RT2/M2 ) 

        √((400×3)/40)=√((2×60)/x) 

        30 = 120/x 

        x = 4.

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