The disproportionation products of ortho phosphorous acid are

The disproportionation products of ortho phosphorous acid are
  1. $\mathrm{H}_3 \mathrm{PO}_4 ; \mathrm{PH}_3$
  2. $\mathrm{H}_3 \mathrm{PO}_2, \mathrm{H}_3 \mathrm{PO}_3$
  3. $\mathrm{H}_3 \mathrm{PO}_4, \mathrm{HPO}_3$
  4. $\mathrm{H}_3 \mathrm{PO}_2, \mathrm{P}_2 \mathrm{H}_4$

Solution

Orthophosphorous acid on heating disproportionate to give orthophosphoric acid and phosphine. $4 \mathrm{H}_3 \mathrm{PO}_3 \xrightarrow{\Delta} 3 \mathrm{H}_3 \mathrm{PO}_4+\mathrm{PH}_3$

Asked in: AP EAMCET 2024 (19 May Shift 2)

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