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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.

Related tags

ScienceClass 10Chemical ReactionsPhysical ChangeChange Of State

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