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An aqueous of a gas (X) shows the follow...

An aqueous of a gas `(X)` shows the following reactions :
(a) It turns red litmus blue.
(b) When added in excess to a copper sulphate solution, a deep blue coloured solution is obtained.
( c) On addition to `FeCl_3` solution, a brownish precipitate is formed, which is solution in `HNO_3`.
Identify `(X)` and give an explanation for step `(a),(b)` and `( c)`.

Text Solution

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`X - NH_(3)`
`FeCl_(3)+3NH_(4)OH rarr underset("brown ppt.")(Fe(OH)_(3)) darr +3NH_(4)Cl`
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