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Ammonia is used in detection of `Cu^(2+)` ion becauseA. aqueous solution of `NH_(3)` reacts with `Cu^(2+)` ion to form deep blue coloured complexB. `NH_(3)` reacts with `Cu^(2+)` ion to give blue precipitate of CuOC. aqueous solution of `NH_(3)` reacts with `Cu^(2+)` ion to form white coloured complexD. `NH_(3)` reacts with `Cu_(2+)` ion to give green precipitate.

Answer» Correct Answer - A
`Cu_((aq))^(2+)+4NH_(3(aq))rarrunderset("Deep blue")([Cu(NH_(3))_(4)]_((aq))^(2+))`


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