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Nitrogen Compounds - Ammonia (Class-XII)

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Multiple Choice

Ammonia is used in detection of $Cu^{2+}$ ion because:

  1. aqueous solution of $NH _{3}$ reacts with $Cu^{2+}$ ion to form deep blue coloured complex
  2. $NH _{3}$ reacts with $Cu^{2+}$ ion to give blue precipitate of $CuO$
  3. aqueous solution of $NH _{3}$ reacts with $Cu^{2+}$ ion to form white coloured complex.
  4. $NH _{3}$ reacts with $Cu^{2+}$ ion to give green precipitate.
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