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  4. The true statement for the acids of phosphorus, H3PO2, H3PO3 and H3PO4 is

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Q. The true statement for the acids of phosphorus, $H_3PO_2$,
$H_3PO_3$ and $H_3PO_4$ is

AIIMSAIIMS 2003The p-Block Elements - Part2

Solution:

$H_3PO_2, H_3PO_3$ and $H_3PO_4$ contain one, two and three ionisable hydrogen atoms respectively.

$H_3PO_2 \rightleftharpoons H^+ + H_2PO_2^-$

$H_3PO_3 \rightleftharpoons H+ + H_2PO_3^- \rightleftharpoons H^+ + HPO_3^{2-}$

$H_3PO_4 \rightleftharpoons H^+ + H_2PO_4^- \rightleftharpoons H^+ + HPO_4^{2-}$

$\rightleftharpoons H^+ + PO_4^{3-}$

But there is very little difference in acidity.

As P is $sp^3$ hybridised in all therefore all are tetrahedral.

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