Chemistry - Ionic Equilibrium Question with Solution | TestHub

Equimolar solutions of HF, HCOOH and HCN at 298 K have the values of${\mathrm{K}}_{\mathrm{a}}$as$6.8\times 10^{-4},1.8\times 10^{-4}$and$4.8\times 10^{-9}$respectively. What will be the order of their acidic strength?