Which one of the following is an air pollutant gas and is released by burning of fossil fuel ?

The correct answer is (d), Sulphur Dioxide.

Sulphur dioxide is a gas that is released into the atmosphere when fossil fuels such as coal, oil, and natural gas are burned. It is a major air pollutant that can cause a variety of health problems, including respiratory problems, heart disease, and cancer.

Hydrogen, nitrogen, and oxygen are not air pollutants. Hydrogen is a flammable gas that is used in fuel cells and other applications. Nitrogen is an inert gas that makes up about 78% of the Earth’s atmosphere. Oxygen is a gas that is essential for life.