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A solution of colourless salt on boiling...

A solution of colourless salt on boiling with excess `NaOH` produces a non-flammable gas. The gas evolution ceases after sometime upon addition of `Zn` dust to the same solution, the gas evolution restarts. The colourless salt (s) is (are).

A

`NH_(4)NO_(3)`

B

`NH_(4)NO_(2)`

C

`NH_(4)Cl`

D

`(NH_(4))_(2)SO_(4)`

Text Solution

Verified by Experts

The correct Answer is:
A,B
All ammonium salts on reaction with alkali produce ammonia.The nitrate and nitrite also on reduction with nascent hydrogen (produced by the reaction of zinc and sodium hydroxide) produce the ammonia gas according to the following reactions.
`NH_(4)NO_(2)+NaOH to NaNO_(2)+NH_(3)+H_(2)O`
`NH_(4)NO_(2)+NaOH to NaNO_(3)+NH_(3)+H_(2)O`
`NaNO_(2)+6[H]overset(Zn//NaOH) to NaOH+NH_(3)+H_(2)O`
`NaNO_(3)+8[H]overset(Zn//NaOH) to NaOH+NH_(3)+2H_(2)O`
So options `(A)` and `(B)` are correct.
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