Subject: Physical Chemistry · Chapter: Ionic Equilibrium · Topic: Ionic Equilibrium – General · Exam: JAM 2001-2022 · Marks: 2 · Difficulty: Medium
The acid dissociation constant $\left(\mathrm{K}_{\mathrm{a}}\right)$ for $\mathrm{HCOOH}, \mathrm{CH}_{3} \mathrm{COOH}, \mathrm{CH}_{2} \mathrm{ClCOOH}$ and $\mathrm{HCN}$ at $25^{\circ} \mathrm{C}$ are $1.8 \times 10^{-4}, 1.8 \times 10^{-5}, 1.4 \times 10^{-3}$ and $4.8 \times 10^{-10}$, respectively. The acid that gives highest pH at the equivalence point when 0.2 M solution of each acid is titrated with a 0.2 M solution of sodium hydroxide is: