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IIT-JEE-Chemistry-Paper 2-2007

Paper II


1.     Consider a titration of potassium dichromate solution with acidified Mohr's salt solution using diphenylamine as indicator. The number of moles of Mohr's salt required per mole of dichromate is

        (A)    3

        (B)    4

        (C)    5

        (D)    6


2.     Among the following metal carbonyls, the C-O bond order is lowest in

        (A)    [Mn(CO)6]+

        (B)    [Fe(CO)5]

        (C)    [Cr(CO)6]

        (D)    [V(CO)6]-

3.     A solution of a metal ion when treated with KI gives a red precipitate which dissolves in excess KI to give a colourless solution. Moreover, the solution of metal ion on treatment with a solution of cobalt (II) thiocyanate gives rise to a deep blue crystalline precipitate. The metal ion is

        (A)    Pb2+

        (B)    Hg2+

        (C)    Cu2+

        (D)    Co2+

4.     Cyclohexene and ozonlysis followed by reaction with zinc dust and water gives compound E. Compound E on further treatment with aqueous KOH yields compound F. Compound F is


5.     The number of stereoisomers obtained by bromination of trans-2-butene is

        (A)    1

        (B)    2

        (C)    3

        (D)    4

6.     Among the following, the least stale resonance structure is


7.     A positron is emitted from 23Na11. The ratio of the atomic mass and atomic number of the resulting nuclide is

        (A)    22/10

        (B)    22/11

        (C)    23/10

        (D)    23/12

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