Equilibrium Question 289
Question: The sulphide ion concentration $ [{S^{2-}}] $ in saturated $ H_2S $ solution is $ 1\times {10^{-22}}. $ Which of the following sulphides should be quantitatively precipitated by $ H_2S $ in the presence of dil. $ HCl $ Sulphide Solubility Product (I) $ 1.4\times {10^{-16}} $ (II) $ 1.2\times {10^{-22}} $ (III) $ 8.2\times {10^{-46}} $ (IV) $ 5.0\times {10^{-34}} $
Options:
A) I, II
B) III, IV
C) II, III, IV
D) Only I
Show Answer
Answer:
Correct Answer: B
Solution:
Basic radicals of group II & IV are precipitated by $ H_2S $ in the form of their sulphides. IInd group in acidic medium & IV group in alkaline medium. They precipitate when ionic product increases than solubility product.
