Which one of the following is not a conjugate acid-base pair?

H N O_{2}, N O_{2}^{-}

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C H_{3} N H_{3}^{+}, C H_{3} N H_{2}

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H_{3} O^{+}, O H^{-}

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C_{6} H_{5} C O O H, C_{6} H_{5} C O O^{-}

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Solution

The correct option is C $H_{3} O^{+}, O H^{-}$
Two substance that differ from each other only by one proton are refered to as conjugate acid-base pair.
except option 'c' all pairs are differ from each other only by one proton and hence they are conjugate acid-base pair.
hence $H_{3} O^{+}, O H^{-}$ are not conjugate acid-base pair.

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