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Question

Which of the following is an example of a permanent change?

A
Melting of wax
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B
Freezing of water
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C
Melting of ice cream
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D
Boiling of an egg
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Solution

The correct option is D Boiling of an egg
The changes which cannot be undone are called permanent changes. Boiling of an egg is a permanent change, because we cannot get back the raw egg from the boiled egg.

The freezing of water, melting of ice cream and melting of wax involves state change. These changes are temporary and can be undone in order to get back the original substance.

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