Question

Passage of ammonia gas through copper sulphate solution forms pale blue precipitate.What is the precipitate?

• A. It decomposes giving reddish brown gas nitric oxide gas which imparts the colour
• B. It decomposes giving reddish brown gas nitrous oxide gas which imparts the colour
• C. It decomposes giving reddish brown gas nitrogen dioxide gas which imparts the colour
• D. It loses its acidic action turning yellowish brown

Answer 1

The correct option is B

It decomposes giving reddish brown gas nitrous oxide gas which imparts the colour

Passage of ammonia gas through copper sulphate solution forms pale blue precipitate of copper hydroxide, which turns into a deep blue coloured solution on passage of excess ammonia.