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Chemistry NMDCAT MCQs Moles and Avogadro's Numbers
nmdcat.online July 2, 2026

In the reaction Zn + 2HCl → ZnCl₂ + H₂, the volume of hydrogen gas liberated at STP when 32.5 g of zinc reacts with excess acid is

A. 5.6 dm³
B. 11.2 dm³
✓
C. 22.4 dm³
D. 33.6 dm³

📝 Explanation

32.5 g Zn = 0.5 mole. It gives 0.5 mole H₂. Volume = 0.5 × 22.4 = 11.2 dm³.

📖 Additional Information

  • 5.6 dm³
  • 11.2 dm³
  • 22.4 dm³
  • 33.6 dm³

32.5 g Zn = 0.5 mole. It gives 0.5 mole H₂. Volume = 0.5 × 22.4 = 11.2 dm³.

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