Which of the following pairs of species is not a conjugate acid-base pair?
a) hocl, ocl-
b) hno2, no2+
c) o2-, oh-
d) hso4-, so42-
e) h2co3, hco3

Answer : The option (c) is not a conjugate acid-base pair.

Explanation :

According to the Bronsted Lowry concept, Bronsted Lowry-acid is a substance that donates one or more hydrogen ion in a reaction and Bronsted Lowry-base is a substance that accepts one or more hydrogen ion in a reaction.

Or we can say that, conjugate acid is proton donor and conjugate base is proton acceptor.

(a) The equilibrium reaction will be,

In this reaction, are act as a conjugate acid-base pair.

(b) The equilibrium reaction will be,

In this reaction, are act as a conjugate acid-base pair.

(c) The equilibrium reaction will be,

In this reaction, are not act as a conjugate acid-base pair.

(d) The equilibrium reaction will be,

In this reaction, are act as a conjugate acid-base pair.

(e) The equilibrium reaction will be,

In this reaction, are act as a conjugate acid-base pair.

Hence, from this we conclude that, the option (c) is not a conjugate acid-base pair but it is a act as conjugate base-acid pair.

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