Question

A group is given with four examples, write down the category of the group and identify the odd one out.

Sulphur dioxide, Carbon monoxide, Oxygen, Nitrogen dioxide.

Answer 1

Sulphur dioxide is not available in the air directly.

1. Sulphur dioxide is the gas that is not present in the air directly all other gases such as carbon monoxide, oxygen, nitrogen oxide are present in the gas.
2. The amount of sulphur dioxide is present in very less amount hence sulphur dioxide is the odd one out in all mentioned gases.
3. It is indirectly available in the air.

Gases such as Carbon monoxide, oxygen, nitrogen oxide are available in the air directly in more quantity.

Sulphur Dioxide is the odd one out.