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Question: On adding excess of \(NH_{3}\) solution to \(CuSO_{4}\) solution, the dark blue colour is due to....

On adding excess of NH3NH_{3} solution to CuSO4CuSO_{4} solution, the dark blue colour is due to.

A

[Cu(NH3)4]++\left\lbrack Cu(NH_{3})_{4} \right\rbrack^{+ +}

B

[Cu(NH3)2]++\left\lbrack Cu(NH_{3})_{2} \right\rbrack^{+ +}

C

[Cu(NH3)]+\left\lbrack Cu(NH_{3}) \right\rbrack^{+}

D

None of the above

Answer

[Cu(NH3)4]++\left\lbrack Cu(NH_{3})_{4} \right\rbrack^{+ +}

Explanation

Solution

CuSO4+4NH3→[Cu(NH3)4]++SO4−−CuSO_{4} + 4NH_{3} \rightarrow \lbrack Cu(NH_{3})_{4}\rbrack^{+ +}SO_{4}^{- -}