The most powerful reducing agent is:

The most powerful reducing agent is:
  1. H3PO3
  2. H3PO4
  3. H4P2O7
  4. H4P2O6

Solution

$H_{3}PO_{3}$ oxidation state of P is+3 , which can further be oxidized to a higher oxidation state. So they can act as reducing agents. In $H_{3}PO_{4}$ oxidation state of P is +5, which is highest for P. Hence $H_{3}PO_{4}$ cannot serve as a reducing agent. *

Asked in: JEE-TOPICTESTS-CHEMISTRY

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