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A solution of colourless salt H on boili...

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

A

`NH_4NO_3`

B

`NH_4NO_2`

C

`NH_4Cl`

D

`(NH_4)_2SO_4`

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