Chemistry NMDCAT MCQs Moles and Avogadro's Numbers Moles and Avogadro’s Numbers

nmdcat.online July 13, 2026

Concerning the reaction 2Mg + O₂ → 2MgO, complete reaction of 4 moles of magnesium requires

A. 1 mole of O₂

B. 2 moles of O₂

✓

C. 3 moles of O₂

D. 4 moles of O₂

📝 Explanation

According to the balanced equation, 2 moles of Mg react with 1 mole of O₂. Therefore, 4 moles of Mg require 2 moles of O₂. Concept tested: Mole ratio application.

📖 Additional Information

1 mole of O₂
2 moles of O₂
3 moles of O₂
4 moles of O₂

According to the balanced equation, 2 moles of Mg react with 1 mole of O₂. Therefore, 4 moles of Mg require 2 moles of O₂. Concept tested: Mole ratio application.

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