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).

Options

A. `NH_(4)NO_(3)`
B. `NH_(4)NO_(2)`
C. `NH_(4)Cl`
D. `(NH_(4))_(2)SO_(4)`

Answer

A, B

Explanation

All ammonium salts on reaction with alkali produce ammonia, nitrates and nitrites which on reduction gives `NH_(3)`
`NH_(4) NO_(2) + NaOH to NaNO_(2) + NH_(3) + H_(2)O`
`NH_(4) NO_(3) + NaOH to NaNO_(3) + NH_(3) + H_2O`
`NaNO_(2) overset(+6[H])underset(Zn/HCl)to NaOH + NH_(3) + H_(2)O`
`NaNO_(3) + 8[H] to NaOH + NH_(3) + 2H_(2)O`