is a molecule of a compound that is used regularly in our daily life.

H_{2} O

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O_{2}

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Solution

The correct option is A $H_{2} O$
Atoms of different elements join together in definite proportions to form a molecule of a compound.

Among the given options, $H_{2} O$ is a molecule of a compound which we use regularly in our daily life — water. Two atoms of hydrogen combine with one atom of oxygen to form a water molecule.

Argon (Ar) is a noble gas that doesn't need to form molecules for existence.

Oxygen is a molecule of an element consisting of only oxygen atoms. It is not a compound.

CO is a molecule of compound which we don't normally come across in daily life. It is highly toxic.

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