Which of the following involves only a physical change?
Answer and explanation
Correct answer: Freezing of water into ice
When water freezes, only its state changes from liquid to solid; both water and ice have the chemical formula \(\mathrm{H_2O}\). Thus, no new substance is formed, so this is a physical change. In contrast, rusting produces a new substance such as iron oxide, making it a chemical change.
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What is the correct answer to this question?
Freezing of water into ice
Why is this the correct answer?
When water freezes, only its state changes from liquid to solid; both water and ice have the chemical formula \(\mathrm{H_2O}\). Thus, no new substance is formed, so this is a physical change. In contrast, rusting produces a new substance such as iron oxide, making it a chemical change.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Chemical Reactions and Equations.
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