1.

A solutionof coloured salt if bollingwithexcess NaOHproducesa non flammable gas .The gas evolvurationcoases aftersometime .Upon additionof Zn dust to the samesolution , the gas evolationrestart .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 :The gas is ammonimia and the saltcan be nitrate or nitrit as SUGGESTED by the following reaction
`NH_(4)NO_(3) + NAOH rarr NaNO_(3) + NH_(3) + H_(2)O`
`NaNO_(3) + 8[H] rarr NaOH + NH_(3) + 2H_(2)O`
`NH_(4)NO_(2) + NaOH rarr NaNO_(3) + NH_(3) + H_(2)O`
`NaNO_(2) + 6[H] rarr NaOH + NH_(3) + H_(2)O`


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