MEDIUMMCQ SINGLEJEE Mains ChemistryPhysical ChemistryIonic equilibriumSalt Hydrolysis

The least soluble compound (salt) of the following is

A.CsCl (Ksp = 10–12)

B.HgS (Ksp = 1 × 10–52)✓ Correct

C.PbCl2 (Ksp = 1.7 × 10–5)

D.ZnS (Ksp = 1.2 × 10–23)

Explanation

Let the solubility of each given salt be S. + 2 sp 12 6 1 sp 2+ 2- 2 sp -52 -26 -1 sp 2+ 2 2 3 sp CsCl s Cs aq. +Cl aq. K =s s= K = 10 =10 molL HgS s Hg aq. +S aq. K =s s= K = 10 =10 molL PbCl Pb aq. +2Cl aq. K = 2s = 4s s 1/3 1/3 5 / 4 1.7 10 / 4 sp s K x 2+ 2 2 sp 23 12 1 sp ZnS s Zn aq. S aq. K s s K 1.2 10 3.5 10 molL x x IONIC EQUILIBRIUM 51 Thus, the least soluble compound is HgS.

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