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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

Verified by Experts

The gas (X) is `NH_(3)`
`NH_(3)+H_(2)Orarr NH_(4)OH`
`CuSO_(4)+4NH_(4)OH rarr [Cu(NH_(3))_(4)]SO_(4)+4H_(2)O`
Ferric chloride gives brown ppt. of `Fe(OH)_(3)`.
`FeCl_(3)+3NH_(4)OHrarrunderset("insoluble in HNO"_(3))underset("Brown ppt ")(Fe(OH)_(3))+3NH_(4)Cl`
`underset("Brown ppt.")(Fe(OH)_(3))+3HNO_(3)rarrunderset("(soluble)")(Fe(NO_(3))_(3))+3H_(2)O`
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