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JEE Main levelSingle correct optionDifficulty 2 of 3ie017

Which of the following is NOT a conjugate acid-base pair in the Bronsted-Lowry sense?

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

Answer: A

Members of a conjugate pair differ by exactly one proton.

H X_{2} SO X_{4}

and

SO X_{4} X^{2 -}

differ by two protons, so they are not a conjugate pair; the other three pairs each differ by one

H X^{+}

.

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