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

Dear student,

A physical change is one that involves changes in the physical properties of a substance such as a state, shape, size, and color, etc. No new substances are formed in a physical change. Also, the original substance can generally be recovered again in a physical change i.e. most physical changes are reversible. 
From the given options Formation of a cloud, Melting of wax, and Evaporation are the example of physical change. 
Blood clotting is an example of chemical change because it includes many types of chemical reactions that are irreversible in nature and a substance combine to form a new substance takes place. 

Hence the correct option is blood clotting.

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