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Question

Among Ni(CO4) , Ni(CN)2−4 and Ni(Cl2−4) :

A
Ni(CO4) and Ni(Cl24) are diamagnetic and Ni(CN)24 is paramagnetic
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B
Ni(Cl24) and Ni(CN)24 are diamagnetic and Ni(CO4) is paramagnetic
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C
Ni(CO4) and Ni(CN)24 are diamagnetic and Ni(Cl24) is paramagnetic
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D
Ni(CO4) is diamagnetic and Ni(Cl24) and Ni(CN)24 are paramagnetic
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Solution

The correct option is B Ni(CO4) and Ni(CN)24 are diamagnetic and Ni(Cl24) is paramagnetic
As CO and CN are strong ligand they form low spin complex and pairing happens, therefore, they are diamagnetic but Cl is a weak ligand, it has higher spin outer orbital complex. In Ni(Cl24) complex Ni has 2 unpaired electron so it is paramagnetic.

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