In which of the folowing rection nitrogen is not reduced ?

1.	In which of the folowing rection nitrogen is not reduced ?
Answer» `NO_(2) rarr NO_(2)^(+)` `NO_(3)^(-) rarr NO` `NO_(3)^(-) rarr NH_(4)^(+)` `NH_(4)^(+) rarr N_(2)` Answer :D

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