• # question_answer White P reacts with caustic soda, the products are $P{{H}_{3}}$ and $Na{{H}_{2}}P{{O}_{2}}$. This reaction is an example of [DCE 2003] A) Oxidation B) Reduction C) Disproportionation D) Neutralisation

Solution :

In this reaction, phosphorus is simultaneously oxidised to $Na{{H}_{2}}P{{O}_{2}}$and reduced to$P{{H}_{3}}$. Hence this reaction is an example of disproportionation. ${{\overset{o}{\mathop{P}}\,}_{4}}+3NaOH+3{{H}_{2}}O\to 3Na{{H}_{2}}\overset{+1}{\mathop{P}}\,O_{2}^{{}}+\overset{-3}{\mathop{P}}\,H_{3}^{{}}$

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