1.

Pure N_(2) gas is obtained from

Answer»

`NH_(3)+NaNO_(2)`
`NH_(4)Cl+NaNO_(2)`
`N_(2)O+Cu`
`(NH_(4))_(2)Cr_(2)O_(7)`

Solution :`underset("(AQ)")(NH_(4)Cl)+ underset("(aq)")(NaNO_(2)) to NH_(4)NO_(2) +NaCl`
`NH_(4)NO_(2) overset("HEAT")tounderset("(g)")(N_(2))+underset("(l)")(2H_(2)O)`


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