Phosphorous acid on heating gives:

Phosphoric acid

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Phosphine

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Phosphinic acid

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Both (a) and (b)

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Solution

The correct option is D Both (a) and (b)
Orthophophorous acid (or phosphorous acid) on heating disproportionates to give orthophosphoric acid (or
phosphoric acid) and phosphine.
$4 H_{3} P O_{3} Δ ⟶ 3 H_{3} P O_{4} + P H_{3}$

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