Question

Which of the following is not a physical change?

A

Tearing a paper

B

Bending an iron rod

C

Freezing water into ice

D

Curdling of milk

Easy

Solution

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Correct option is
D

Curdling of milk

The tearing of paper is a physical change because it remains the same. Tearing a paper is a physical change because when the paper is torn only the appearance of the paper is changed and no new substance is formed. And freezing water into ice does not change its chemical constituents. Only phase changes from solid to liquid.

Cheese is made when an enzyme called rennet is added to milk. The rennet causes a chemical reaction where the milk solids curdle, separating themselves from the whey, or liquid portion of the milk

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