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

For the reaction 2Na + 2H₂O → 2NaOH + H₂, 4.6 g sodium reacts completely with water. The amount of hydrogen produced is

A. 0.2 mol
B. 0.1 mol
✓
C. 0.05 mol
D. 0.4 mol

📝 Explanation

4.6 g Na = 0.2 mol. From the equation, 2 mol Na produce 1 mol H₂. Hence 0.2 mol Na produces 0.1 mol H₂.

📖 Additional Information

  • 0.2 mol
  • 0.1 mol
  • 0.05 mol
  • 0.4 mol

4.6 g Na = 0.2 mol. From the equation, 2 mol Na produce 1 mol H₂. Hence 0.2 mol Na produces 0.1 mol H₂.

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