Which of the following is a physical change?

Kingsley Thompson December 19, 2025

 Which of the following is a physical change?

A. The bubbling of chlorine into water

B. The bubbling of chlorine into a jar containing hydrogeen

C. The dissolution of sodium chloride in water

D. The passing of steam over heated iron


The correct answer is:

C. The dissolution of sodium chloride in water

Explanation:

  • Physical change does not produce a new substance and is usually reversible.

  • When sodium chloride dissolves in water, it can be recovered by evaporation, so no new substance is formed.

Why the others are not correct:

  • A. Bubbling chlorine into water forms new substances → chemical change

  • B. Chlorine reacting with hydrogen forms hydrogen chloride → chemical change

  • D. Steam reacting with heated iron forms iron oxide and hydrogen → chemical change

✅ Correct answer: C

QUESTION 1

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Kingsley Thompson

Posted by: Kingsley Thompson

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