Ammonia is used in detection of `Cu^(2+)` ion because

Options

A. aqueous solution of `NH_3` reacts with `Cu^(2+)` ion to form deep blue coloured complex
B. `NH_3` reacts with `Cu^(2+)` ion to give blue precipitate of CuO
C. aqueous solution of `NH_3` reacts with `Cu^(2+)` ion to form white coloured complex
D. `NH_3` reacts with `Cu^(2+)` ion to give green precipitate CuO

Answer

A