An aqueous solution of an anhydrous white solid A on addition of KCN solution gives a white precipitate B. Addition of excess of

An aqueous solution of an anhydrous white solid A on addition of KCN solution gives a white precipitate B. Addition of excess of KCN to the precipitate dissolves if forming C.
A. `K_(2)[Cr(CN)_(4)`
B. `K_(3)[Cu(CN)_(4)]`
C. `CuCN`
D. `Cu(CN)_(2)`

An aqueous solution of an anhydrous white solid A on addition of KCN solution gives a white precipitate B. Addition of excess of KCN to the precipitat

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