Chemistry Question from JEE Main 2026 · 24 January, Shift 1

Consider two Group IV metal ions $X^{2+}$ and $Y^{2+}$. A solution containing $0.01 \, \text{M} \, X^{2+}$ and $0.01 \, \text{M} \, Y^{2+}$ is saturated with $H_2S$. 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 $25^\circ \text{C}$ $K_{sp}(\mathrm{YS}) = 4 \times 10^{-16}$ at $25^\circ \text{C}$ $[\mathrm{H_2S}] = 0.1 \, \text{M}$ $K_{a1} \times K_{a2}(\mathrm{H_2S}) = 1.0 \times 10^{-21}$ $\log 2 = 0.30,\ \log 3 = 0.48,\ \log 5 = 0.70$