1.

An aqueous solution of a gas (X) turns red litmus blue. When added in excess to copper sulphate solution, deep blue colour is obtained. On addition to a ferric .chloride solution a brown precipitate soluble in dilute nitric acid is obtained. Hence, (X) is

Answer»

`SO_(2)(G)`
`H_(2)S(g)`
`NO_(2)(g)`
`NH_(3)(g)`

Solution :The gas (X) is `NH_(3)`.
`NH_(3)(g)+"Red litmus" to "Blue"`
`CuSO_(4)+underset((X))(4NH_(3))(aq)tounderset("Deep blue")([CU(NH_(3))_(4)])SO_(4)`
`3NH_(3)+3H_(2)O+FeCl_(3)toFe(OH)_(3)+3NH_(4)CL`
`Fe(OH)_(3)+3HNO_(3)toFe(NO_(3))_(3)+3H_(2)O`
Hence,(D) is the corret answer.


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