The number of unpaired d-electrons in is

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Solution

Q.
The number of unpaired $d$ -electrons in ${[{Co(H}_{2} {O)}_{6}]}^{3 +}$ is ________ . [2024]

1 1

2 0

3 4

4 2

Ans.
(2)

   ${[{Co(H}_{2} {O)}_{6}]}^{3 +}$

  Oxidation number of Co = +3

${Co}^{3 +} = {}_{18}{[Ar]} 3 d^{6}$

With ${Co}^{3 +}$ , ligands like $H_{2} O$ acts as strong field ligands. With strong field ligands, $d^{6}$ complexes split as $t_{2 g}^{2, 2, 2}, e_{g}^{0, 0}$

  So it has no unpaired electrons.

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