Question

For H3PO3 and H3PO4, the correct choice is

Solution

Correct option is

H3PO3 is dibasic and reducing

The structure of H3PO3 is as given below. There are only two –OH groups and hence it is dibasic. The oxidation number of P in this acid is +3, whereas P may have +5 oxidation state also. Therefore, H3PO3 can be oxidised which means H3PO3 is a reducing agent. 

                                                               

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