JEE Advanced 2024 Paper 2 · Q16 · Stability & Applications
PARAGRAPH II: 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 moles of potassium iodide required to produce two moles of P is _____.
Reveal answer + step-by-step solution
Correct answer:3
Solution
The reaction of $KI$ with potassium ferricyanide gives potassium ferrocyanide along with $KI_3$: $3KI + 2K_3[Fe(CN)_6] \to 2K_4[Fe(CN)_6] + KI_3$. Here P is the ferrocyanide complex $K_4[Fe(CN)_6]$. To produce 2 moles of P, 3 moles of KI are required.
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