Class 11 NEET Chemistry Equilibrium Questions Part 1

(i) H2A

Ka1

⇌

HA−+H+
(ii) HA−

Ka2

⇌

A2−+H+
In the 1‌st ‌ step H+ ion comes from neutral molecule, while in the 2‌nd ‌ step the H+ ion comes from negatively charged ions. The presence of -ve charge makes the removal of H+ ion difficult.
Thus, Ka1>Ka2