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CuSO(4) decolourises on addition KCN , ...

`CuSO_(4)` decolourises on addition `KCN` , the product is

A

`[Cu(CN)_(4)]^(2-)`

B

`Cu^(2+)` get reduced to form `[Cu(CN)_(4)]^(3-)`

C

(C) `Cu(CN)_(2)`

D

`CUCN`

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The correct Answer is:
A
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