Which among the following is major component of Gobar Gas?

The correct answer is Option (4) → Methane

Gobar gas, or biogas, is made in a biogas plant when cow dung and other plant and animal waste are broken down by bacteria in the absence of air. Its main component is methane (up to about 75 per cent); the rest is mostly carbon dioxide, with small amounts of hydrogen and hydrogen sulphide. Methane burns with a clean blue flame and little smoke, which makes biogas a good fuel for cooking and lighting in villages, while the slurry left behind is used as manure.