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-)`

Explanation

An acid-base which differs by a proton only `(HA hArr A^(-) +H^(+))` is known as conjugate acid-base pair.
Conjugate acid :`HCN,H_(2)O,HCO_(3)^(-),HS^(-)`
Conjugate base : `NO_(2)^(-), CIO_(4)^(-), O_(2)^(-)`.