Answer:
Both \[\overset{+1}{\mathop{{{H}_{3}}P{{O}_{2}}}}\,\]
and \[\overset{+3}{\mathop{{{H}_{3}}P{{O}_{3}}}}\,\] can increase the oxidation
state of phosphorus upto + 5. They therefore, act as good reducing agents.
However, in \[\overset{{}}{\mathop{{{H}_{3}}P{{O}_{4}}}}\,\], oxidation state
of phosphorus is already +5 (maximum possible oxidation state).
It can act as an oxidising agent and not
as a reducing agent.
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