Question

why is milk regarded as a mixture and not as a pure substance

Answer 1

because it is made up of several substances for e.g. water, carbohydrates etc. and there can be impure substances also

Answer 2

Hey mate!!

Here's ur answer dear:-)
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Milk is regarded as a mixture and not as a pure substance because milk Consists of fatty acids, proteins, minerals, etc. Hence it is a colloidal mixture.

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нσρє ιт нєℓρѕ:-)☺️☺️☺️