_________ is the smallest unit of matter which may or may not have an independent existence, but always takes part in a chemical reaction.

An Atom

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A compound

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A crystal

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All the above

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Solution

The correct option is A An Atom
An atom is the smallest unit of matter which takes part in a chemical reaction, it may or may not have an independent existence.

A compound is formed by definite composition of atoms. Example- Water ( $H_{2} O$ )- there are 2 Hydrogen atoms and 1 oxygen atom.

A crystal is a periodic arrangement of atoms or ions. Example- Cu, NaCl

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