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

Gujarat BoardEnglish MediumSTD 12 ScienceChemistry5. Co-ordination chemistry1 Mark
MCQ
Among the following ions which one has the highest paramagnetism
  • A
    ${\left[ {Cr{{({H_2}O)}_6}} \right]^{3 + }}$
  • ✓
    ${\left[ {Fe{{({H_2}O)}_6}} \right]^{2 + }}$
  • C
    ${\left[ {Cu{{\left( {{H_2}O} \right)}_6}} \right]^{2 + }}$
  • D
    ${\left[ {Zn{{\left( {{H_2}O} \right)}_6}} \right]^{2 + }}$
✓

Answer

Correct option: B.
${\left[ {Fe{{({H_2}O)}_6}} \right]^{2 + }}$
b
(b) ${[Fe{({H_2}O)_6}]^{2 + }}$ has four unpaired electrons, ${[Cr{({H_2}O)_6}]^{3 + }},$${[Cu{({H_2}O)_6}]^{2 + }}$ and ${[Zn{({H_2}O)_6}]^{2 + }}$ have $3, 1, 0$  unpaired electrons respectively.

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