Question

$Al+N{O}_2^{-}\to Al(OH{)}_4^{-}+N{H}_3$
The oxidizing agent for this reaction is________.

• A. $Al$
• B. $N$
• C. $O$
• D. both $A$ and $B$

Answer 1

The correct option is B $N$

In the reaction $Al$ from oxidation state $0$ changing to $Al{(OH{)}_4}^{-}$ oxidation state $+3$. The increase in oxidation state shows element is oxidized means reacting as a reducing agent.

And the other reactant in the reaction $N$ in $N{O_2}^{-}$ from oxidation state $+3$ changing to $N{H}_3$ oxidation state $-3$. The decrease in oxidation state shows element is reduced means reacting as an oxidizing agent. Thus $N$ is an oxidizing agent in the reaction.