GKFix MCQ Question

What is the equilibrium constant expression for the reaction Fe^3+(aq) + SCN^–(aq) ⇌ Fe(SCN)^2+(aq)?

• A. Kc = [Fe^3+][SCN^–] / [Fe(SCN)^2+]
• B. Kc = [Fe(SCN)^2+] / ([Fe^3+][SCN^–])
• C. Kc = [Fe(SCN)^2+] / [Fe^3+]