The octahedral diamagnetic low spin complex among the following is [2023]

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Solution

Q.
The octahedral diamagnetic low spin complex among the following is [2023]

1 ${[{NiCl}_{4}]}^{2 -}$

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

3 ${[{CoF}_{6}]}^{3 -}$

4 ${[{CoCl}_{6}]}^{3 -}$

Ans.
(2)

$In {[Co {({NH}_{3})}_{6}]}^{3 +}, {NH}_{3} is a strong field ligand,$

${Co}^{3 +} \Rightarrow 3 d^{6} \Rightarrow t_{2 g}^{2, 2, 2} e_{g}^{0, 0} \Rightarrow Diamagnetic$

$In {[{NiCl}_{4}]}^{2 +}, Cl is a weak field ligand,$

${Ni}^{2 +} \Rightarrow 3 d^{8} \Rightarrow t_{2 g}^{2, 2, 2} e_{g}^{1, 1} \Rightarrow Paramagnetic$

$In {[{CoF}_{6}]}^{3 +}, F is a weak field ligand,$

${Co}^{3 +} \Rightarrow 3 d^{6} \Rightarrow t_{2 g}^{2, 1, 1} e_{g}^{1, 1} \Rightarrow Paramagnetic$

$In {[{CoCl}_{6}]}^{3 -}, Cl is a weak field ligand,$

${Co}^{3 +} \Rightarrow 3 d^{6} \Rightarrow t_{2 g}^{2, 1, 1} e_{g}^{1, 1}$

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