(C) $H_3PO_4$ is a triprotic acid. Its dissociation occurs in three steps:$I$. step: $H_3PO_4 \rightleftharpoons H^{+} + H_2PO_4^-$$II$. step: $H_2PO_

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(C) $H_3PO_4$ is a triprotic acid. Its dissociation occurs in three steps:$I$. step: $H_3PO_4 \rightleftharpoons H^{+} + H_2PO_4^-$$II$. step: $H_2PO_4^- \rightleftharpoons H^{+} + HPO_4^{2-}$$III$. step: $HPO_4^{2-} \rightleftharpoons H^{+} + PO_4^{3-}$Therefore,the total number of steps is $3$.