Question

Which of the following is not a fossil fuel?
(a) coal
(b) petroleum gas
(c) biogas
(d) natural gas

Answer 1

The correct option is (c):

Explanation of the correct option:​

1. ​Biogas is a mixture of methane, carbon dioxide, hydrogen and hydrogen sulphide.
   
2. It is produced by the anaerobic degradation of animal wastes such as cow dung in the presence of water.
3. This is a source of energy produced from the renewable sources.
   

Explanation of the incorrect options:​

Option (a):

1. Coal is a fossil fuel which is produced as the plants pressurized under multiple layers of earth's crust are converted to coal.
   

Option (b):

1. ​Petroleum gas is one of the components produced from crude oil.
   
2. Crude oil is a fossil fuel produced from fossilized animals and plants.
   

Option (d):

1. Natural gas is also one of the fossil fuel collected from deep layers under the earth's crust.
   

​Final Answer: Biogas is not a fossil fuel.