All India Engineering / Architecture Entrance Examination (AIEEE)

AIEEE 2010 Chemistry

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Q. 7. The energy required to break one mole of Cl–Cl bonds in Cl3 is 242 kJ mol-1. The longest wavelength of light capable of breaking a single Cl–Cl bond is

  1. 594 nm
  2. 640 nm
  3. 700 nm
  4. 494 nm

Sol :

Answer: (4)

Q. 8. Which one of the following has an optical isomer?

  1. [Zn(en)(NH3)2]-1
  2. [Co(en)3]3+
  3. [Co(H2O)4(en)]3+
  4. [Zn(en)4]2+ (en = ethylenediamine)

Sol :

14sol_op1
Square planar complexes of Zn2+ cannot show optical isomerism. So, options (1) and (4) are ruled out.

14sol_op2
will have two planes of symmetry, so it is optically inactive. Thus optically active compound is

as it has no plane of symmetry.

Answer: (2)

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