(A) : The ionization constants of weak diprotic acid are in the order of ${\mathrm{K}}_{{\mathrm{a}}_1}>{\mathrm{K}}_{{\mathrm{a}}_2}$
(R) : Removal of H⁺ from anion is difficult as compare to neutral atom.

The ionization constants of weak diprotic acid are in order of ${\mathrm{K}}_{{\mathrm{a}}_1}>{\mathrm{K}}_{{\mathrm{a}}_2}$​​ due to more stability of conjugate base (lower charge density) and removal of H+ from anion is difficult as compared to neutral atom.