Magnetic moment of [Ni(CN)_4]^ 2- is zero but that of [Ni(H_2O)_4]^ 2+ is 2.83 BM. It is because of

JEE Advanced Chemistry question

Magnetic moment of is zero but that of is 2.83 BM. It is because of

(A)Different oxidation state of Ni in two complexes
(B) is a strong ligand making two unpaired electrons in paired while in , two electrons remain unpaired, being weak ligandCorrect
(C)Both (a) and (b)
(D)None of the above

Answer: (B)

Solution

In both complexes nickel is present in the same oxidation state, +2 (), ruling out (a). The strong-field ligand causes large crystal-field splitting, forcing the two otherwise-unpaired -electrons of to pair up in a

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Question ID VK-159643