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Q.
The reaction $P_4 + 3NaOH + 3H_2O \rightarrow 3NaH_2PO_2 + PH_3 $ is an example of
Redox Reactions
Solution:
$P _{4}+3 NaOH +3 H _{2} O \rightarrow PH _{3}+3 NaH _{2} PO _{2}$
In reactant $P$ is present in $(0)$ oxidation state and in $PH _{3}$, it is present in $(-3)$ oxidation state and in $NaH _{2} PO _{2}$ it is present in $(+1)$ oxidation state. P undergoes both oxidation and reduction. So this is an example of disproportionation reaction.