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

40. For the reaction 2KClO₃ → 2KCl + 3O₂, 245 g of KClO₃ is decomposed. The maximum volume of O₂ at STP is

A. 33.6 dm³
B. 67.2 dm³
✓
C. 22.4 dm³
D. 44.8 dm³

📝 Explanation

245 g = 2 mol KClO₃. O₂ = 3 mol. Volume = 3 × 22.4 = 67.2 dm³.

📖 Additional Information

  • 33.6 dm³
  • 67.2 dm³
  • 22.4 dm³
  • 44.8 dm³

245 g = 2 mol KClO₃. O₂ = 3 mol. Volume = 3 × 22.4 = 67.2 dm³.

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