Chemistry - Ionic Equilibrium Question with Solution | TestHub

HCl: Strong acid (low pH)
$\mathrm{N}{\mathrm{H}}_4\mathrm{C}\mathrm{l}$: Salt of weak base + strong acid$\to$it gives acidic solution. (pH less than 7)
KCl: Salt of strong base + strong base$\to$it gives neutral solution with pH$=$7.
NaCN: Salt of strong base + weak acid$\to$it gives basic solution with pH > 7.
Thus the increasing order of pH is
$\mathrm{H}\mathrm{C}\mathrm{l}<\mathrm{N}{\mathrm{H}}_4\mathrm{C}\mathrm{l}<\mathrm{K}\mathrm{C}\mathrm{l}<\mathrm{N}\mathrm{a}\mathrm{C}\mathrm{N}$