GKFix MCQ Question

What is the equilibrium expression for the reaction FeO(s) + CO(g) ⇌ Fe(s) + CO₂(g)?

• A. [CO₂]/[CO]
• B. [Fe][CO₂]/[FeO][CO]
• C. [CO]/[CO₂]
• D. [CO₂][FeO]/[CO][Fe]