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Types of Redox Reactions

White P react...

Question

White P reacts with caustic soda. The products are ${P H}_{3}$ and ${N a H}_{2} {P O}_{2}$ . The reaction is an example of:

A

Oxidation

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B

Reduction

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C

Oxidation and reduction

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D

Neutralization

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Solution

The correct option is C Oxidation and reduction
In this reaction, phosphorus is simultaneously oxidised to $N a H_{2} P O_{2}$ and reduced to $P H_{3}$ . Hence this reaction is an example of disproportionation.

${o P}_{4} + 3 N a O H + 3 H_{2} O \to 3 N a H_{2} + 1 P O_{2} + - 3 P H_{3}$

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