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  4. Dissociation of H3PO4 occurs in following stages

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Q. Dissociation of $H_3PO_4$ occurs in following stages

The p-Block Elements - Part2

Solution:

$H_3PO_4 \rightleftharpoons H^+ + H_2PO_4^-$
$H_2PO_4^- \rightleftharpoons H^+ + HPO^{2-}_4$
$HPO^{2-}_4 \rightleftharpoons H^++ PO^{3-}_4$