The first and second | Ionic Equilibrium | JEE Main 2026

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Question

The first and second ionization constants of a weak dibasic acid $\mathrm{H}_2 \mathrm{~A}$ are $8.1 \times 10^{-8}$ and $1.0 \times 10^{-13}$ respectively. 0.1 mol of $\mathrm{H}_2 \mathrm{~A}$ was dissolved in 1 L of 0.1 M HCl solution. The concentration of $\mathrm{HA}^{-}$in the resultant solution is :

Select the correct option:

A

0.1 M

B

$9.53 \times 10^{-6} \mathrm{M}$

C

$8.1 \times 10^{-8} \mathrm{M}$

D

$1.0 \times 10^{-13} \mathrm{M}$

✓ Correct! Well done.

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