Chemistry NMDCAT MCQs
Limiting and Excess Reactants
nmdcat.online
July 2, 2026
A reaction mixture contains 5 moles of CO and 2 moles of O₂ reacting to form CO₂ (2CO + O₂ → 2CO₂). The number of moles of CO₂ formed and excess reactant remaining are
A.
4 moles CO₂, 1 mole CO
✓
B.
5 moles CO₂, no excess
C.
4 moles CO₂, no excess
D.
5 moles CO₂, 1 mole O₂
📝 Explanation
O₂ is limiting. Four moles CO₂ are formed and 1 mol CO remains.
📖 Additional Information
4 moles CO₂, 1 mole CO
5 moles CO₂, no excess
4 moles CO₂, no excess
5 moles CO₂, 1 mole O₂
O₂ is limiting. Four moles CO₂ are formed and 1 mol CO remains.
