Final answer:
The correct chemical formula for lead (II) chloride is PbCl₂, which is option d). PbCl₂ dissociates into Pb²⁺ and Cl⁻ ions in solution, and the addition of extra chloride ions will decrease its solubility according to Le Châtelier's Principle.
Step-by-step explanation:
The chemical formula for lead (II) chloride is represented by PbCl₂. This compound consists of lead ions with a 2+ charge (Pb²⁺) and chloride ions with a 1- charge (Cl⁻). When lead (II) chloride is in solution, it dissociates into Pb²⁺ and Cl⁻ ions, and the balanced dissociation reaction is:
PbCl₂ (s) => Pb²⁺ (aq) + 2Cl⁻ (aq)
If more chloride ions are introduced into the solution, Le Châtelier's Principle predicts that the equilibrium will shift to form more solid lead (II) chloride, thus decreasing the solubility of the compound. The correct chemical formula for lead (II) chloride from the provided options is d) PbCl₂.