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Solution


Q.

Arrange the following in increasing order of solubility product :                

Ca(OH)2, AgBr, PbS, HgS                           [2025]
 
1 PbS<HgS<Ca(OH)2<AgBr  
2 HgS<AgBr<PbS<Ca(OH)2  
3 Ca(OH)2<AgBr<HgS<PbS  
4 HgS<PbS<AgBr<Ca(OH)2  

Ans.

(4)

Ca(OH)2 can be regarded as a strong base, it is partially soluble in water. AgBr has less covalent character than PbS and HgS as per Fajan’s rule (lesser is charge on cation, lesser is its polarizing power. Lesser is charge on anion, lesser is its polarization). Hg2+ has pseudo noble gas configuration, hence covalent character of HgS is more than that of PbS. More is covalent character, lesser is solubility in water. Hence solubility in water is:  HgS < PbS < AgBr < Ca(OH)2.