Consider the following:

  1. Carbon dioxide (CO2)
  2. Methane
  3. Hydrogen sulphide (H2S)
  4. Water (H2O)

Which of the above is/are principal component(s) of biogas?

Answer: [D] 1, 2, 3 & 4

Biogas is produced by biological breakdown of organic matter by bacteria in the absence of oxygen.

This question is a part of GKToday's Integrated IAS General Studies Module