1.

A solution of colourlesssalt H on holing with excess NaOH produces a non-flammable gas .The gas evolution ceses after sometime. Upon addition of Zn dust to the same solution the gas evolutionrestarts .The colourless salt(s) H is (are)

Answer»

`NH_(4)NO_(3)`
`NH_(4)NO_(2)`
`NH_(4)CI`
`(NH_(4))_(2)SO_(4)`

Solution :`NH_(4)ON_(3) + NaOH rarr NH_(3) + NaNO_(3) + H_(2)O`
`7NaOH + NANO + 4Zn rarr 4Na_(2)ZnO_(2) + NHO_(3) + 2H_(2)O`
`NH_(4)ON_(2) + NaOH rarr NaNO_(2) + NH_(3) + H_(2)O`
`3Zn + 5NaOH + NaNO_(2)+ rarr 3Na_(2)ZnO_(2) + NH_(3)O`


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