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Bronsted Lowry Theory

Which of the ...

Question

Which of the following is not a conjugate pair?

H C I

and

C l^{-}

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H_{2} S O_{4}

and

S O_{4}^{2 -}

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O H^{-}

and

H_{2} O

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N H_{3}

and

N H_{4}^{+}

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H C_{2} H_{3} O_{2}

and

C_{2} H_{2} O_{2}^{-}

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Solution

The correct option is B $H_{2} S O_{4}$ and $S O_{4}^{2 -}$
In an acid-base reaction, an acid form a conjugate base by donating a proton while a base forms a conjugate acid by accepting that proton.
Acid $+$ Base $\to$ Conjugate Base $+$ Conjugate Acid
$H_{2} S O_{4}$ and $S O_{4}^{2 -}$ is not a conjugate pair.
A conjugate acid base pair differs by one proton. In the above pair, there is a difference of two protons. The conjugate base of acid $H_{2} S O_{4}$ is $H S O_{4}^{-}$ .

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