When \( \mathrm{KCN} \) is added to \( \mathrm{CuSO}_{4} \) solution: (a) KCN acts an reducing a...

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When \( \mathrm{KCN} \) is added to \( \mathrm{CuSO}_{4} \) solution:
(a) KCN acts an reducing agent
(b) KCN acts as an complexing agent
(c) \( \mathrm{K}_{3}\left[\mathrm{Cu}(\mathrm{CN})_{4}\right] \) is formed
(d) All are correct
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