Question
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 moles of P is