Which of the following complex is diamagnetic ?

{[C o F_{6}]}_{6}^{3 -}

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{[N i C l_{4}]}_{4}^{2 -}

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{[N i {(N H_{3})}_{6}]}_{6}^{2 +}

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{[N i {(C N)}_{4}]}_{4}^{2 -}

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Solution

The correct option is B ${[N i {(C N)}_{4}]}_{4}^{2 -}$
${[N i {(C N)}_{4}]}_{4}^{2 -}$
As it have zero unpaired electron so its diamagnetic.

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{[N i {(C N)}_{4}]}_{4}^{2 -}

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	Column I		Column II
A	$[C r (N H_{3})_{6}]^{3 +}$	P	Tetrahedral and paramagnetic
B	$[C o (C N)_{6}]^{3 -}$	Q	Octahedral and diamagnetic
C	$[N i (C N)_{4}]^{3 -}$	R	Octahedral and paramegnetic
D	$[N i (C l)_{4}]^{2 -}$	S	Square planar and diamagnetic

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