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Q.
$H_3PO_3$, phosphorus acid is
The p-Block Elements - Part2
Solution:
Due to more electronegativity difference between $H$ and $O$, the $H$ atom attached to $O$ is detached rather than the $H$ attached to $P$.
So, when $H _{3} PO _{3}$ is added to water, only $2 H ^{+}$ions are released, $SO , H _{3} PO _{3}$ is a diprotic acid.
