For H3PO3 and H3PO4, the correct choice is

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H3PO3 is dibasic and reducing agent

H3PO3 is dibasic and non-reducing agent

H3PO4 is tribasic and reducing agent

H3PO3 is tribasic and non-reducing agent

answer is A.

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Detailed Solution

H3PO3 is a dibasic acid as it has 2 number of replaceable OH groups(Dibasic) attached to phosphorous. The oxyacids of phosphorous are reducing agents.H3PO3 is a good reducing agent than H3PO4 . The reducing nature of these acids is based on the no of hydrogen atoms bonded to the central metal atom. As more number of H attached to phosphorous more is its reducing nature. In the case of H3PO3, there is one P−H bond which is responsible for it's reducing character whereas there is no such bonding in case of H3PO4.

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