Q.

H3PO3 is diprotic while H3PO2 is monoprotic. Why?

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answer is 1.

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Detailed Solution

In H3PO3, 2 hydrogen are attached to oxygen.
In H3PO2, 1 hydrogen is attached to oxygen.

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H3PO3 is diprotic while H3PO2 is monoprotic. Why?