In which of the following reactions does the | vedclass

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(A) To determine if oxidation occurs,we calculate the oxidation state of nitrogen in each reaction:$1$. In $NH_4^+ 	o N_2$: The oxidation state of $N

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$NH_4^+ 	o N_2$

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(A) To determine if oxidation occurs,we calculate the oxidation state of nitrogen in each reaction:$1$. In $NH_4^+ 	o N_2$: The oxidation state of $N$ changes from $-3$ to $0$. Since the oxidation state increases,this is an oxidation reaction.$2$. In $NO_3^- 	o NO$: The oxidation state of $N$ changes from $+5$ to $+2$. This is a reduction.$3$. In $NO_2 	o NO_2^-$: The oxidation state of $N$ changes from $+4$ to $+3$. This is a reduction.$4$. In $NO_3^- 	o NH_4^+$: The oxidation state of $N$ changes from $+5$ to $-3$. This is a reduction.Therefore,the correct option is $A$.

In which of the following reactions does the oxidation of nitrogen occur?

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