Calculation of oxidation number of nitrogen in ammonium nitrite `NH_(4)NO_(2)`

Explanation

This is an ionic compound containing `NH_(4)^(+) and NO_(2)^(-)` ions.
The oxidation number of nitrogen in `NH_(4)^(+)` ion=-3
The oxidation number of nitrogen `NO_(2)^(-)` ion =+3
Thus, one atom of nitrogen in ammonium nitrate is in -3 oxidation state, while the other nitrogen atoms is in +3 oxidation state.