Question

Ammonia is used in detection of $C{u}^{2+}$ ion because

• A. aqueous solution of $N{H}_3$ reacts with $C{u}^{2+}$ ion to form deep blue coloured complex
• B. $N{H}_3$ reacts with $C{u}^{2+}$ ion to give blue precipitate of CuO
• C. aqueous solution of $N{H}_3$ reacts with $C{u}^{2+}$ ion to form white coloured complex
• D. $N{H}_3$ reacts with $C{u}^{2+}$ ion to give green precipitate

Answer 1

Answer: (A)

Ammonia is used in detection of $C{u}^{2+}$ ion because aqueous solution of $N{H}_3$ reacts with $C{u}^{2+}$ ion to form deep blue coloured complex.

$C{u}_{(aq)}^{2+}+4N{H}_{3(aq)}\to {\left[Cu{\left(N{H}_3\right)}_4\right]}_{(aq)}^{2+}$ Deep blue