GKFix MCQ Question

What is the balanced chemical equation for the formation of Prussian blue?

• A. Fe²⁺ + CN⁻ → [Fe(CN)₆]⁴⁻
• B. Fe³⁺ + SCN⁻ → [Fe(SCN)]²⁺
• C. 3[Fe(CN)₆]⁴⁻ + 4Fe³⁺ → Fe₄[Fe(CN)₆]₃
• D. Ag⁺ + Cl⁻ → AgCl