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NEET levelSingle correct optionDifficulty 1 of 3ia020

The conjugate base of $H X_{2} PO X_{4} X^{-}$ is

A $HPO X_{4} X^{2 -}$
B $H X_{3} PO X_{4}$
C $PO X_{4} X^{3 -}$
D $H X_{3} O X^{+}$

Answer: A

A conjugate base is formed by loss of one proton.

H X_{2} PO X_{4} X^{-} HPO X_{4} X^{2 -} + H X^{+}

, so the conjugate base is

HPO X_{4} X^{2 -}

.

H X_{3} PO X_{4}

is the conjugate acid.

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