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Question

CuSO4 decolourises on addition of excess KCN, the product is:

A
[CuCN)4]2
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B
Cu2+ get reduced to form [Cu(CN)4]3
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C
Cu(CN)2
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D
CuCN
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Solution

The correct option is A [CuCN)4]2

As [Cu(CN)4]2 is diamagnetic in nature thereby not having unpaired e for d-d transition to show color.
Cu2+ 4s03d9
(Refer to Image)
All es are paired as CN is a strong ligand.

1021714_1090922_ans_5609658d8ee64c0094bb7032912131e9.PNG

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