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Question

An aqueous solution of a gas (X) shows the following reactions.
(i) It turns red litmus blue.
(ii) When added in excess to a CuSO4 solution, a deep blue colour is obtained.
(iii) On addition of FeCl3 solution, a brown precipitate soluble in dilute HNO3 is obtained.
Then the gas (X) will be :

A
SO2
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B
NH3
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C
NO2
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D
N2O
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Solution

The correct option is B NH3
Option (B) is correct.
The gas X will be NH3.
(i) Ammonia gas turns red litmus blue thus it is basic in nature.
(ii) Ammonia reacts with copper sulphate to form deep blue coloured complex [Cu(NH3)4]SO4.
CuSO4+4NH3[Cu(NH3)4]SO4(deepbluecolour)
(iii) Ammonia reacts with ferric chloride to form brown ppt of ferric hydroxide.
FeCl3+NH3+H2OFe(OH)3[brown ppt]+NH4Cl
Brown precipitate of ferric hydroxide is soluble in dilute HNO3.

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