JEE Main 2023 Chemistry question

A litre of buffer solution contains 0.1 mole of each of and . On the addition of 0.02 mole of HCl by dissolving gaseous HCl, the pH of the solution is found to be (Nearest integer) [Given : = 4.745 log 2 = 0.301 log 3 = 0.477 T = 298 K]