Nitrogen Compounds - Ammonia (Class-XII)
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Multiple Choice
Ammonia is used in detection of $Cu^{2+}$ ion because:
- aqueous solution of $NH _{3}$ reacts with $Cu^{2+}$ ion to form deep blue coloured complex
- $NH _{3}$ reacts with $Cu^{2+}$ ion to give blue precipitate of $CuO$
- aqueous solution of $NH _{3}$ reacts with $Cu^{2+}$ ion to form white coloured complex.
- $NH _{3}$ reacts with $Cu^{2+}$ ion to give green precipitate.