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.



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