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Question

Which of these given options is not a physical change?

A
Cutting of trees
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B
Boiling of water
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C
Crushing a can
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D
Milk turning into curd
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Solution

The correct option is D Milk turning into curd
Cutting off trees, boiling water, crushing a can involves changes in the physical properties like shape, size and phase change of the same substance,but when milk changes to curd, a substance (curd) is formed and hence there is a chemical change taking place.

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