What is the precipitate formed on passage of Ammonia gas through copper sulphate solution which looks pale blue?

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

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

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It decomposes giving reddish brown gas nitrogen dioxide gas which imparts the colour

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It loses its acidic action turning yellowish brown

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Solution

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.

$C u S O_{4} + 2 N H_{4} O H \to (N H_{4})_{2} S O_{4} + C u (O H)_{2}$

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