Question 5 — Iron reacts with moist - Questions at the end of the chapter - Chapter 8 Class 8 - Nature of Matter: Elements, Compounds (Curiosity)

Last updated at July 13, 2026 by

Q 5
Question

Iron reacts with moist air to form iron oxide, and magnesium burns in oxygen to form magnesium oxide. Classify all the substances involved in the above reactions as elements, compounds or mixtures, with justification.

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Answer
Iron, magnesium, oxygen = elements; oxides = compounds; air = mixture.

Explanation

Substance Type Reason
Iron Element Cannot be broken into simpler substances.
Magnesium Element A single pure metal.
Oxygen Element A single pure non-metal.
Moist air Mixture Air with water vapour mixed in.
Iron oxide Compound Iron and oxygen joined chemically.
Magnesium oxide Compound Magnesium and oxygen joined chemically.
Pure metals and oxygen are elements; the oxides are compounds; moist air is a mixture.
← Back to concept: 8.3.2 Compounds
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