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

H₃PO₃ is tribasic and non-reducing agent

H₃PO₄ is tribasic and reducing agent

answer is A.

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Detailed Solution

H₃PO₃is 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.