Chemical And Ionic Equilibrium Result Question 20

20. The $\mathrm{pH}$ of $0.1 \mathrm{M}$ solution of the following salts increases in the order

(1999,2 M)

(a) $\mathrm{NaCl}<\mathrm{NH} _4 \mathrm{Cl}<\mathrm{NaCN}<\mathrm{HCl}$

(b) $\mathrm{HCl}<\mathrm{NH} _4 \mathrm{Cl}<\mathrm{NaCl}<\mathrm{NaCN}$

(c) $\mathrm{NaCN}<\mathrm{NH} _4 \mathrm{Cl}<\mathrm{NaCl}<\mathrm{HCl}$

(d) $\mathrm{HCl}<\mathrm{NaCl}<\mathrm{NaCN}<\mathrm{NH} _4 \mathrm{Cl}$