12. What do you understand by a pure substance? Is milk a pure substance?
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A compound is formed by two or more chemical elements that are chemically bonded together. We know that pure substances are elements or compounds. But milk is not a pure substance. ... Thus, milk is not a pure substance or a compound that is made up of one type of atom or molecule.
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A substance that has a fixed chemical composition throughout is called a pure substance such as water, air, and nitrogen. A pure substance does not have to be of a single element or compound.
Now as we know that we get milk from the cow and it is a mixture of water, fat and solids (in the form of milk protein and carbohydrates) which is mixed irrationally. Therefore milk is a mixture not a pure substance.
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