The correct statement among the following is: [2026]

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Solution

Q.
The correct statement among the following is: [2026]

1 $Ni {(CO)}_{4} and [Ni {(CN)}_{4}]$ ^2-are diamagnetic and ${[{NiCl}_{4}]}^{2 -}$ is paramagnetic.

2 $Ni {(CO)}_{4}$ is diamagnetic and ${[{NiCl}_{4}]}^{2 -} and {[Ni {(CN)}_{4}]}^{2 -}$ are paramagnetic

3 $Ni {(CO)}_{4} $ and ${[{NiCl}_{4}]}^{2 -}$ are diamagnetic and ${[Ni {(CN)}_{4}]}^{2 -}$ is paramagnetic.

4 ${[Ni {(CN)}_{4}]}^{2 -}$ and ${[{NiCl}_{4}]}^{2 -}$ are diamagnetic and $Ni {(CO)}_{4}$ is paramagnetic.

Ans.
(1)

${[Ni {(CN)}_{4}]}^{2 -} \to 3 d^{8} \to diamagnetic \to d s p^{2}$

$[{Ni(CO)}_{4}] \to 3 d^{10} \to diamagnetic \to s p^{3}$

${[{NiCl}_{4}]}^{2 -} \to 3 d^{8} \to e^{2, 2} t_{2}^{2, 1, 1} \to s p^{3} \to paramagnetic$

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