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:

Updated On: Jan 21, 2026
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Correct Answer: 2 - 3

Solution and Explanation

Step 1: Analyze the reaction pathways. \[ K_4[Fe(CN)_6] + 3ZnCl_2 \rightarrow K_2Zn_3[Fe(CN)_6]_2 + 6KCl \] This gives 3 zinc ions. Alternatively: \[ K_4[Fe(CN)_6] + 2ZnCl_2 \rightarrow Zn_2[Fe(CN)_6] + 4KCl \] This gives 2 zinc ions.
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