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Which of the following substances increases in mass when heated in air?

Chemistry
WAEC 2001

Which of the following substances increases in mass when heated in air?

  • A. Sodium chloride
  • B. lodine crystals
  • C. magnesium ribbon
  • D. copper (ll) oxide
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Correct Answer: Option C
Explanation

The mass of magnesium ribbon increases when heated in air because it combines with oxygen to form magnesium oxide, a white powder: 

The chemical equation for this reaction is:

2Mg + O2 → 2MgO

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