1.

In which one of the following reactions, nitrogen is not reduced?

Answer»

`NO_2to NO_(2)^(-)`
`NO_(3)^(-)to NO`
`NO_(3)^(-) toNH_(4)^(+)`
`NH_(4)^(+)toN_2`

Solution :`overset(+4) ( NO_(2)to overset(+3) (NO_(2)^(-)) , overset(+5) (NO_(3)) tooverset(+2) (NO)`
`overset(+5)(NO_(3)^(-) )to overset( -3) (NH_4^( +)) , overset(-3) (NH_(4)^( +)to overset( 0 )N_2`


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