Which of the following is not an example of a physical change?

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Cutting of wood

Melting of wax

Setting curd from milk

Folding of paper

answer is C.

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Detailed Solution

A change in which a substance undergoes a change in its physical properties and no new substance is formed is called a physical change.
In cutting wood and folding paper no new substance is formed. Only the shape is changed. So they are examples of physical change.
In the melting of wax, no new substance is formed. Only the state of the substance is changed which can be reversed by cooling. So it is also an example of physical change
The setting of curd from milk involves a chemical reaction. A new substance is formed and the process cannot be reversed. So it is a chemical change.
So the correct answer is setting curd from milk.

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