Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 12
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What happens when H3PO3 is heated? - Chemistry

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What happens when 

H3PO3 is heated ?

Write the reactions involved.

What happens when H3PO3 is heated? Write the equations.

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Solution 1

On heating, H3PO3 decomposes into phosphoric acid and phosphine.

 

Solution 2

H3PO3, on heating, undergoes disproportionation reaction to form PH3 and H3PO4. The oxidation numbers of P in H3PO3, PH3, and H3PO4 are +3, −3, and +5 respectively. As the oxidation number of the same element is decreasing and increasing during a particular reaction, the reaction is a disproportionation reaction.

Concept: P - Block Group 15 Elements - Phosphine
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