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Chemistry NMDCAT MCQs Limiting and Excess Reactants
nmdcat.online July 2, 2026

A reaction vessel contains 4 moles of P₄ and 10 moles of O₂ reacting according to P₄ + 5O₂ → P₄O₁₀. The excess reactant and amount remaining are

A. P₄, 2 moles
✓
B. O₂, 2 moles
C. P₄, 1 mole
D. O₂, 5 moles

📝 Explanation

O₂ limits the reaction. Only 2 mol P₄ react, leaving 2 mol P₄.

📖 Additional Information

  • P₄, 2 moles
  • O₂, 2 moles
  • P₄, 1 mole
  • O₂, 5 moles

O₂ limits the reaction. Only 2 mol P₄ react, leaving 2 mol P₄.

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