In which of the folowing rection nitrogen is not reduced ?

Options

A. `NO_(2)rarrNO^(2^(+))`
B. `BNO_(3)^(-)rarrNO`
C. `NO_(3)^(-)rarrNH_(4)^(+)`
D. `NH_(4)^(+)rarrN_(2)`

Explanation

`overset(+4)NO_(2)rarroverset(+3)NO_(2)^(+),overset(+5)NO_(3)^(-)rarroverset(+2)NO`
`overset(+5)O_(3)^(-)rarroverset(-3)H_(4),overset(-3)NH_(4)^(+)rarroverset(0)N_(2)`
In .there is increase in the O.N of N also.Therefore, N atom is oxidi9sed and not reduced N atom is oxidised and not reuced.