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Ammonium hydroxide is added in excess to...

Ammonium hydroxide is added in excess to an aqueous solution of `CuS0_(4)` blue in colour to form a deep blue complex compound. What is the C.N. of copper in the complex?

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The correct Answer is:
4
`CuSO_(4)+4NH_(4)OHrarr[Cu(NH_(3))_(4)]SO_(4)+4H_(2)O" "C.N. of Cu = 4`
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