Which of the following acts as reducing ...

Which of the following acts as reducing agent and why ? `H_3 PO_3` or `H_3 PO_4`.

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`H_3PO_3` acts as a reducing agent, whereas `H_3PO_4` does not. This can be explained on the basis of their structure.

Due to presence of unstable `P-H` bond `H_3PO_3`, it acts as a reducing agent.

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