When excess of dilute `NH_4 OH` is added to an aqueous solution of copper sulphate, an intense blue colour is obtained. This is

When excess of dilute `NH_4 OH` is added to an aqueous solution of copper sulphate, an intense blue colour is obtained. This is due to the presence of
A. `CuSO_(4)`
B. `Cu(OH)_(2)`
C. `[Cu(NH_(3))_(4)]^(2+)`
D. `(NH_(4))_(2)SO_(4)`

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When excess of dilute `NH_4 OH` is added to an aqueous solution of copper sulphate, an intense blue colour is obtained. This is due to the presence of

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