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Allotropes of Phosphorus

Which P rea...

Question

Which $P$ reacts with caustic soda, the products are $P H_{3}$ and $N a H_{2} P O_{2}$ . This reaction is an example of:

A

Hydrolysis

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B

Reduction

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C

Disproportionation

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D

Neutralisation

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Solution

The correct option is B Disproportionation
When phosphorus dissolves in caustic soda $(N a O H)$ , phosphine $(P H_{3})$ gas is liberated along with formation of sodium hypophosphite $(N a H_{2} P O_{2})$ .

$3 N a O H + P_{4} + 3 H_{2} O ⟶ 3 N a H_{2} P O_{2} + P H_{3}$

Here phosphorous has oxidation state of 0. It forms $(P H_{3})$ and $(N a H_{2} P O_{2})$ . as compound which have oxidation states as $- 3$ and $+ 1$ .

It is undergoing disproportionation reaction

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