Assertion (A): $C O_{2}$ is a molecule of a compound.
Reason (R): Molecules of compounds consist of different kinds of atoms.

Both A and R are true but R is not the correct explanation of A

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Both A and R are true and R is the correct explanation of A

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Both A and R are false

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A is true but R is false

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Solution

The correct option is B Both A and R are true and R is the correct explanation of A
Molecules of compounds are made up of different kinds of atoms.
Example-
$C O_{2}$ is made up of 1 carbon and 2 oxygen atoms. Therefore, it is a molecule of a compound.

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A molecule of a compound is made up of atoms of different elements.

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The molecules of a compound contain atoms of the ______ kind. (different/same)

Assertion (A): Ozone is an example of a molecule of an element.

Reason (R): Molecules formed by different kind of atoms is known as molecule of an element.

Assertion (A): Compounds are invariably homogeneous.

Reason (R): Compounds are constituted of only one kind of molecule distributed uniformly.

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