In which of the following examples is no new substance formed and only a change of state occurs?
Answer and explanation
Correct answer: Freezing of water into ice
Freezing of water into ice is a change of state from liquid water to solid water; the chemical formula remains \(\mathrm{H_2O}\). Therefore, no new substance is formed, and it is a physical change. In contrast, rusting forms a new substance, iron oxide, so it is 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?
Freezing of water into ice is a change of state from liquid water to solid water; the chemical formula remains \(\mathrm{H_2O}\). Therefore, no new substance is formed, and it is a physical change. In contrast, rusting forms a new substance, iron oxide, so it is 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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