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5. Co-ordination chemistry — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistry5. Co-ordination chemistry1 Mark
MCQ
Which one of the following is expected to be a paramagnetic complex
  • ✓
    ${\left[ {Ni{{\left( {{H_2}O} \right)}_6}} \right]^{2 + }}$
  • B
    $\left[ {Ni{{\left( {CO} \right)}_4}} \right]$
  • C
    ${\left[ {Zn{{\left( {N{H_3}} \right)}_4}} \right]^{2 + }}$
  • D
    ${\left[ {Co{{\left( {N{H_3}} \right)}_6}} \right]^{ + 3}}$
✓

Answer

Correct option: A.
${\left[ {Ni{{\left( {{H_2}O} \right)}_6}} \right]^{2 + }}$
a
(a) The configuration of $N{i^{2 + }}$has two unpaired electron so it is paramagnetic.

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