GKFix MCQ Question

What is the equilibrium constant for the reaction 2NO2(g) ⇌ N2O4(g)?

• A. [NO2]^2 / [N2O4]
• B. [N2O4]^2 / [NO2]
• C. [N2O4] / [NO2]^2
• D. [NO2] / [N2O4]^2