Question

The reaction, $P_4+3NaOH+3H_{2}O\to 3Na{H}_{2}P{O}_2+P{H}_3$ is example of_____________.

• A. Disproportionation reaction
• B. Neutralisation reaction
• C. Double decomposition reaction
• D. Pyrolytic reaction

Answer 1

The correct option is A Disproportionation reaction

$P_4+3NaOH+3H_{2}O\to P{H}_3+3Na{H}_{2}P{O}_2$

In reactant $P$ is present in $\left(0\right)$ oxidation state and in $P{H}_3$, it is present in $(-3)$ oxidation state and in $Na{H}_{2}P{O}_2$ it is present in $(+1)$ oxidation state.

$P$ undergoes both oxidation and reduction. So this is an example of disproportionation reaction.