GKFix MCQ Question

What is the correct expression for Qc for the reaction 2NO(g) + O2(g) ⇌ 2NO2(g)?

• A. Qc = [NO]^2[O2] / [NO2]^2
• B. Qc = [NO2] / ([NO][O2])
• C. Qc = [NO] / ([O2][NO2])
• D. Qc = [NO2]^2 / ([NO]^2[O2])