Which has minimum solubility?

Step-by-step solution

Solubilities of salts are as follows : aligned Bi ₂ ~S ₃ & = [5] K_ s p 108 & = [5] 1.6 10⁻⁷² 108 =1.7 10⁻¹⁵ Ag ₂ ~S & = [3] K_ s p 4 = [3] 1.6 10⁻⁴⁹ 4 & =3.4 10⁻¹⁷ PbS & = K_ s p = 1.1 10⁻²⁹ & =3.3 10⁻¹⁵ CoS & = K_ s p = 2 10⁻²⁷ =4.5 10⁻¹⁴ aligned Hence, Ag ₂ ~S is least soluble. So minimum solubility is of Ag ₂ ~S as its force of attraction is greatest.