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The main constituent of Biogas and CNG is:
1. Propane
2. Hydrogen Sulphide
3. Methane
4. Ethane

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Correct Answer - Option 3 : Methane

Concept:

Biogas: The mixture of gases that are produced due to the breakdown of organic matter in the absence of oxygen is called biogas.

  • The major constituent of biogas is Methane and Carbon dioxide while some traces of H2S and ammonia are also there.
  • It is released when the Cow, Buffalo, and Pig manure is processed Anaerobically i.e. in the absence of Oxygen.
  • Biogas can be used for Space Heating, Generation of Electricity, Fuel for Cooking, etc
Biogas Composition
Sl.No. Compound Percentage
1 Methane 50 - 75%
2 Carbon dioxide 25 - 50%
3 Nitrogen 10 - 20%
4 Hydrogen 0 - 1%
5 Hydrogen sulfide 0 - 3%
6 Oxygen 0 - 0.5%

 

Compressed Natural Gas (CNG): it is composed of compressed Methane and Ethane.

  • It can be used in place of gasoline, diesel fuel and liquefied petroleum gas (LPG)

Explanation:

  • The main constituent of both Biogas and CNG is Methane.
  • So the correct option is Methane.

Note: Biogas is a Clean Renewable Energy Source and even it is Economically Friendly.

Methane is commonly known as Marsh Gas.

  • Methane is the hydrocarbon having the lowest molecular mass with the chemical formula CH4.
  • It is called Marsh gas because it is released in huge amounts from marshes where anaerobic bacteria decompose matter.
  • It was discovered by Alessandro Volta in 1776.
  • It is the main constituent of Biogas and Compressed Natural Gas (CNG).
  • It is a Greenhouse gas and its global warming potential is 28 - 36 times as that of CO2.
  • Paddy fields are also a huge source of Methane emissions.

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