Match the gases in column I with their odour in column II.

A - 2, B - 1, C - 3

The correct answer is option 2. A - 2, B - 1, C - 3.

Here is the reason for the matching:

A. \(CO_2\) (Carbon Dioxide) - 2. A colourless, odourless gas

Carbon dioxide is a colorless and odorless gas. It is commonly found in the Earth's atmosphere and is a natural component of air.

B. \(H_2S\) (Hydrogen Sulfide) - 1. Colourless gas with the smell of rotten eggs

Hydrogen sulfide is a colorless gas that has a distinct smell resembling rotten eggs. It is often produced by decaying organic matter and is known for its unpleasant odor.

C. \(SO_2\) (Sulfur Dioxide) - 3. Colourless gas with a pungent smell

Sulfur dioxide is a colorless gas with a pungent and irritating smell. It is commonly produced during the combustion of sulfur-containing fuels, such as in industrial processes and some types of fossil fuel combustion.

So, the correct match is A - 2, B - 1, C - 3.