Question:medium
Phosphorus acid ($\mathrm{H_3PO_3}$) on heating undergoes disproportionation to give:
Phosphorus acid ($\mathrm{H_3PO_3}$) on heating undergoes disproportionation to give:
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Remember the important disproportionation reactions:
\[
4\mathrm{H_3PO_3}
\rightarrow
3\mathrm{H_3PO_4}
+\mathrm{PH_3}
\]
\[
2\mathrm{H_3PO_2}
\rightarrow
\mathrm{H_3PO_4}
+\mathrm{PH_3}
\]
These are frequently asked in competitive examinations.
Updated On: Jun 17, 2026
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The Correct Option is A
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