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For `H_3 PO_3` and `H_3 PO_4`, the correct choice is

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For `H_3 PO_3` and `H_3 PO_4`, the correct choice is
A. `H_3PO_3` is dibasic and reducing agent
B. `H_3PO_3` is diabasic and non-reducing agent
C. `H_3PO_4` is tribasic and reducing agent
D. `H_3PO_3` is tribasic and non-reducing agent
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