JEE Main · 2025 · 08 Apr 2025 · Shift 2 · p-Block Elements

Among the Group 16 hydrides, acid strength increases down the group because the $\mathrm{H}-\mathrm{E}$ bond lengthens and weakens, so ${\mathrm{H}}_2\mathrm{Te}$ is more acidic than ${\mathrm{H}}_2\mathrm{Se}$; the first statement, which asserts the reverse, is false. Bond dissociation enthalpy decreases down the group, and that of ${\mathrm{H}}_2\mathrm{Se}$, about $276{\text{kJ mol}}^{-1}$, exceeds that of ${\mathrm{H}}_2\mathrm{Te}$, about $238{\text{kJ mol}}^{-1}$, so the second statement is true. The first statement is false while the second is true.