Answer:
PbS or lead sulfide show less solubility in water and insoluble in nitric acid.
Step-by-step explanation:
PbS dissociates in water.The reaction is -
PbS(s)⇄Pb²⁺ (aq) + S²⁻(aq)
The sulfide ion which is produced in the reaction is a strong comjugated base that contain weak acid like Hydrogen sulfide.The above reaction of S²⁻ with strong acid like nitric acid decrease the concentration of sulfide ion and results in equilibrium reacion that shifts the equation to right side and thus increases the solubility.
S²⁻(Aq) + HNO₃(Aq)⇄ HS (Aq)+ NO₃ (Aq)