GKFix MCQ Question

What is the correct expression for Qc for the reaction CaCO3(s) ⇌ CaO(s) + CO2(g)?

• A. Qc = [CaO][CO2] / [CaCO3]
• B. Qc = [CaCO3] / ([CaO][CO2])
• C. Qc = [CaO] / ([CaCO3][CO2])
• D. Qc = [CO2]