Which of the following statements is correct?

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(B) The conjugate base of an acid is formed by the removal of a proton $(H^+)$.For the acid $H_2PO_4^-$,the reaction is $H_2PO_4^- \rightarrow H^+ + H

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The conjugate base of $H_2PO_4^-$ is $HPO_4^{2-}$.

Vedclass · Answer

(B) The conjugate base of an acid is formed by the removal of a proton $(H^+)$.For the acid $H_2PO_4^-$,the reaction is $H_2PO_4^- \rightarrow H^+ + HPO_4^{2-}$.Thus,the conjugate base of $H_2PO_4^-$ is $HPO_4^{2-}$.Option $A$ is incorrect because the $pH$ of $10^{-8} \ M \ HCl$ is slightly less than $7$ due to the contribution of $H^+$ from water.Option $C$ is incorrect because the auto-protolysis constant $(K_w)$ of water increases with temperature.Option $D$ is incorrect because the $pH$ at the equivalence point for a weak acid-strong base titration is greater than $7$.

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