Equilibrium: JEE Main 2026 Chemistry question

Consider two Group IV metal ions $\mathrm{X^{2+}}$ and $\mathrm{Y^{2+}}$. A solution containing 0.01 M $\mathrm{X^{2+}}$ and 0.01 M $\mathrm{Y^{2+}}$ is saturated with $\mathrm{H_2S}$. The pH at which the metal sulphide YS will form as a precipitate is ______. (Nearest integer) (Given: $K_{sp}(\mathrm{XS}) = 1 \times 10^{-22}$ at 25°C, $K_{sp}(\mathrm{YS}) = 4 \times 10^{-16}$ at 25°C, $[\mathrm{H_2S}] = 0.1$ M in solution, $K_{a1} \times K_{a2}(\mathrm{H_2S}) = 1.0 \times 10^{-21}$, log 2 = 0.30, log 3 = 0.48, log 5 = 0.70)