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Question

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

A
HNO2,NO2
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B
CH3NH+3,CH3NH2
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C
H3O+,OH
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D
C6H5COOH,C6H5COO
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Solution

The correct option is C H3O+,OH
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 H3O+,OH are not conjugate acid-base pair.

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