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Q.
White phosphorus reacts with caustic soda, the products are $PH_{3}$ and $NaH_{2}PO_{2}$ This reaction is an example of
Redox Reactions
Solution:
$\overset{0}{P_{4}}+3NaOH +3H_{2}O \to 3 NaH_{2}\overset{+1}{PO_{2}}+\overset{-3}{P}H_{3}$
$P$ undergoes oxidation $(\overset{0}{P_{4}} \to NaH_{2} \, \overset{+1}{PO_{2}})$ as well as $(\overset{0}{P_{4}} \to \overset{-3}{P}H_{3})$ in the same reaction. Thus, it is a disproportionation reaction