Paragraph: When potassium iodide is added to an aqueous solution of potassium ferricyanide, a reversible reaction is observed in which a complex ( P ) is formed. In a strong acidic medium, the equilibrium shifts completely towards ( P ). Addition of zinc chloride to ( P ) in a slightly acidic medium results in a sparingly soluble complex Q. Question: The number of moles of potassium iodide required to produce two mol