`H_3PO_3` acts as a reducing agent but `H_3PO_4` does not. Why?

H_(3)PO_(3) acts as a reducing agent but H_(3)PO_(4) does not why?

H_(3)PO_(3) acts as a reducing agent while H_(3)PO_(4) does not-Explain. Mention the basicities ol these two acids.

H_3 PO_3 is diprotic. Why?

This question has Statement I and Statement II. Of the four choices given after the Statements, choose the one that best describes the two Statements. Statement - I : H_3PO_3 is a dibasic acid and its salt Na_3PO_3 does not exist Statement - II : Being dibasic nature, only two H are replaceable.

Give reasons for the following: H_(3)PO_(2) is a stronger reducing agent than H_(3)PO_(3)

Mention two reactions in which H_(2) acts as a reducing agent and an oxidising agent respectively.

CO_2 act as oxidising agent but not reducing agent-why?

Explain- H_(3)PO_(2) is a strong reducing agent.

Give reasons: H_(3)PO_(3) undergoes disproportionation reaction, but H_(3)PO_(4) does not.

Give an example where NH_(3) acts as a reducing agent .