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What is meant by the conjugate acid-base...

What is meant by the conjugate acid-base pair? Find the conjugate acid`//`base for the following species:
`HNO_(2), CN^(Θ), HClO_(4), F^(Θ), overset(Θ)(O)H, CO_(3)^(2-)`, and `S^(2-)`

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An acid-base pair which differ by a proton is called conjugate acid base pair .
`NO_(2)^(-), HCN, ClO_(4)^(-) , HF, H_(2)O ` (acid) or `O^(2-) ` (base), `HCO_(3)^(-) and HS^(-)`.
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PRADEEP-EQUILIBRIUM-NCERT (Questions and Exercises with Answers)
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