Multiple choice

Which of the following is a physical change?

  1. Combustion of fuel

  2. Glowing of a platinum wire

  3. Electrolysis of acidulated water

  4. Passing carbon dioxide through lime water
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Glowing of a platinum wire involves only a physical change - the wire becomes hot and emits light due to increased temperature, but its chemical composition remains unchanged. The other options involve chemical changes: combustion converts fuel to new substances, electrolysis breaks water into hydrogen and oxygen, and carbon dioxide reacts with lime water to form calcium carbonate.

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