Give example of pure substances.

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Solution

Pure substances are a class of compounds that have constant composition and chemical properties.
Elements and compounds belong to this category.
Elements
They are made up of the same kind of atoms.
They can not be broken down into simpler substances by any simple chemical processes.
Example: Oxygen ( $(O)$ , Carbon $(C)$ .
Compounds
They are made up of different kinds of atoms that are combined chemically
Example: $H_{2} O$ , $HCl$

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