The deep blue colour produced by adding an excess of ammonia to copper sulphate is due to the presence of:

C u^{2 +}

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[C u (N H_{3})_{4}]^{2 +}

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[C u (N H_{3})_{6}]^{2 +}

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[C u (N H_{3})_{2}]^{2 +}

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Solution

The correct option is C $[C u (N H_{3})_{4}]^{2 +}$
$C u S O_{4} + 4 N H_{3} \to [C u (N H_{3})_{4}] S O_{4}$

The deep blue colour produced is due to the presence of $[C u (N H_{3})_{4}]^{2 +}$ .
Option B is correct.

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Copper sulphate solution forms blue coloured complex with excess of ammonia. Its formula is:

(X)

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