When potassium iodide is added to an aqueous solution of potassium ferricyanide, a reversible reacti

Question

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 $Q$.\ The number of zinc ions present in the molecular formula of $Q$ is $\_\_\_\_$ .\

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