Incorrect order of solubility product (K_sp) of given precipitated compound is : — Qualitative and Quantitative Analysis Chemistry Question

💡 Solution & Explanation

Step 1: Check the solubility products of the compounds in the options. In Group I, AgCl (Ksp ~ 1.8 x 10^-10) is much less soluble than PbCl2 (Ksp ~ 1.6 x 10^-5). In Group III/IV, Al(OH)3 (Ksp ~ 10^-33) is much less soluble than Zn(OH)2 (Ksp ~ 10^-17). In Group V/VI, BaCO3 (Ksp ~ 5 x 10^-9) is less soluble than MgCO3 (Ksp ~ 3 x 10^-5). Step 2: For transition metal sulfides, Ag2S (Ksp ~ 6 x 10^-51) is extremely insoluble compared to MnS (Ksp ~ 2.5 x 10^-13), meaning Ag2S is far less soluble and has a much smaller Ksp than MnS. Step 3: Therefore, the order MnS < Ag2S is incorrect, making option (d) the correct choice.