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Q.

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

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a

${HPO}_{4}^{2 -}, {PO}_{4}^{3 -}$

b

${HPO}_{4}^{-}, {HPO}_{4}^{2 -}$

c

${H_{2} {PO}_{4}}^{-}, {PO}_{4}^{3 -}$

d

${H_{2} {PO}_{4}}^{-}, H_{3} {PO}_{4}$

answer is D.

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Detailed Solution

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A pair of acid and base which different by only one proton

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