Question

Circle the odd one out. Give reasons for your choice.

water vapor, carbon dioxide, dust particles, propane, argon.

Answer 1

Propane is the odd one out.

Reason - It is found in natural gas and is not a component of air.

Natural gas - It is the mixture of gases obtained during the extraction of crude oil from the earth's crust. It contains gases like methane(CH₄), ethane(C₂H₆), and propane(C₃H₈).

The other gases given above are components of air.

Composition of air -

1. Nitrogen - 78%
2. Oxygen - 21%
3. carbon dioxide - 0.04%
4. Noble gases - 0.9%
5. Water vapours - variable
6. Dust particles - variable