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Assertion : $\mathrm{H}_3 \mathrm{PO}_2$ has strong reducing property but $\mathrm{H}_3 \mathrm{PO}_4$ does not.Reason : $\mathrm{P}-\mathrm{OH}$ bond present in $\mathrm{H}_3 \mathrm{PO}_4$.
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If both assertion and reason are true but reason is not the correct explanation of assertion
Oxoacids of phosphorus which contain $\mathrm{P}-\mathrm{H}$ bond act as reducing agents and reduce metal salts to free metals. Thus, $\mathrm{H}_3 \mathrm{PO}_2$ act as reducing agent while $\mathrm{H}_3 \mathrm{PO}_4$ does not.
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