Chemistry - Salt Analysis Question with Solution | TestHub

Statement (A) is true: The solubility product ($K_{sp}$) of AgCl ($\approx 1.8\times 10^{-10}$) is much greater than that of AgI ($\approx 8.5\times 10^{-17}$) because iodide is larger and forms a more covalent, less soluble lattice.

Statement (B) is true: In qualitative salt analysis, CuS belongs to Group II (precipitated in acidic medium due to an extremely low $K_{sp}\approx 6\times 10^{-36}$), while NiS belongs to Group IV because it has a significantly higher $K_{sp}$ ($\approx 1\times 10^{-24}$).

Statements (C) and (D) are false: These statements directly contradict the standard experimental solubility product values for those specific metal salts.