Which of the following changes exhibit that nitrogen undergo... | CHEMISTRY - REDOX REACTIONS IN TERMS OF ELECTRON TRANSFER REACTIONS | SolveeIt

Which of the following changes exhibit that nitrogen undergoes oxidation?

$NH_4 \rightarrow N_2$

$NO_2 \rightarrow NO$

$NO_2 \rightarrow NO_2$

$NO_3 \rightarrow NH_4$

Answer

$NH_4 \rightarrow N_2$

Explanation

For oxidation, the oxidation state of nitrogen must increase.

In (A): In $NH_4^+$ , nitrogen has an oxidation state of $-3$ ; in $N_2$ , nitrogen has an oxidation state of $0$ .
In (B): $NO_2$ (N: +4) to $NO$ (N: +2) is a reduction (decrease in oxidation state).
(C) shows no change.
In (D): $NO_3^-$ (N: +5) to $NH_4^+$ (N: -3) is also a reduction.

Thus, only (A) exhibits oxidation of nitrogen.

Nitrogen in $NH_4^+$ goes from oxidation state $-3$ to $0$ in $N_2$ , indicating oxidation.

Question: Which of the following changes exhibit that nitrogen undergoes oxidation?...