Which of the following gas is present in minute quantity and increases day by day in our atmosphere?

Carbondioxide

The correct answer is option 2. Carbondioxide.

Air consists of a mixture of gases. By volume, about 78% of this mixture is nitrogen and about 21% is oxygen.

Carbon dioxide, argon, methane, ozone and water vapour are also present in very small quantities.

Level of CO₂ is increasing day by day due to human activities, power plants, automobiles exhaust etc.