Equilibrium: JEE Main 2026 Chemistry question

At 25$^\circ$C, 20.0 mL of 0.2 M weak monoprotic acid HX is titrated against 0.2 M NaOH. The pH of the solution (a) at the start of the titration (when NaOH has not been added) and (b) when 10 mL of NaOH is added respectively, are : Given : $K_a=5\times10^{-4}$, $pK_a=3.3$, $\alpha\ll1$