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Question

H3PO2 is strong reducing agent H3PO4
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Solution

Dear Student,

Strong reducing agent will be the one which will undergo oxidation fast. In H3PO2, oxidation state of P is +3 whereas in H3PO4 oxidation state of P is +5 which is the maximum oxidation state of P. So H3PO4 will not oxidise further and so is a weak reducing agent. On the other hand, H3PO2 can oxidise till +5 oxidation state, and thus act as stronger reducing agent than H3PO4.

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