The blue colour obtained by the addition of excess dil. `NH_(4)OH` to an aqueous solution of a salt containing copper is due to

The blue colour obtained by the addition of excess dil. `NH_(4)OH` to an aqueous solution of a salt containing copper is due to the presence of `:`
A. `CuSO_(4)`
B. `Cu(OH)_(2)`
C. `(NH_(4))_(2)SO_(4)`
D. `[Cu(NH_(3))_(4)]^(+2)`

The blue colour obtained by the addition of excess dil. `NH_(4)OH` to an aqueous solution of a salt containing copper is due to the presence of `:`

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