Question

The main constituent of biogas is

• A. Methane
• B. Carbon dioxide
• C. Hydrogen
• D. Hydrogen sulphide

Answer 1

The correct option is A

Methane

Explanation for correct option:

(A) Methane.

• Biogas is an environmentally friendly source of renewable energy.
• It is produced when certain bacteria break down organic material in anaerobic environments.
• Methane, hydrogen, and carbon dioxide are all present in it.
• Agricultural waste, food waste, animal dung, manure, and sewage can all contribute to its production.
• The primary byproduct of biogas is methane gas. Methane makes up about $70\%$ of the gas that is produced; the remainder is made up of ammonia and carbon dioxide.

Explanation for incorrect option:

(B) Carbon dioxide

• Carbon dioxide is also present in biogas but it is not a primary constituent. So, this is an incorrect option.

(C)) Hydrogen

• Hydrogen is also present in biogas but it is in a smaller amount. So, this is an incorrect option.

(D) Hydrogen sulfide

• Hydrogen sulfide is also present in biogas but it is in a smaller amount. So, this is an incorrect option.

Hence, the correct option is (A) methane which is the primary constituent of biogas.