Question

$H_{3}P{O}_4$ is stronger oxidant than $H_{3}P{O}_3$ but weaker acid than $H_{3}P{O}_3$.
If true enter 1, else enter 0.

• A. 1
• B. 0
• C. can't determined
• D. either 1 or 0

Answer 1

The correct option is A 1

The oxidation number of P in $H_{3}P{O}_4$ and $H_{3}P{O}_3$ are $+5$ and $+3$ respectively.
Higher is the oxidation number, higher will be the tendency to attract electrons and better will be the oxidizing power.
Thus, $H_{3}P{O}_4$ is stronger oxidant than $H_{3}P{O}_3$.
However, $H_{3}P{O}_4$ is weaker acid than $H_{3}P{O}_3$.
The acid dissociation constants of $H_{3}P{O}_4$ and $H_{3}P{O}_3$ are $7.5\times {10}^{-2}$ and $1.6\times {10}^{-2}$ respectively.