The major constituent of gobar gas is A. Carbon dioxide B. Methane C. Butane D. Isobutane

The correct answer is B. Methane.

Gobar gas is a type of biogas that is produced by the anaerobic decomposition of animal manure. It is a renewable energy source that can be used for cooking, heating, and lighting. The major constituent of gobar gas is methane, which is a colorless, odorless, and flammable gas. Methane is also the primary component of natural gas.

Carbon dioxide is a greenhouse gas that is produced when organic matter is burned. It is also a byproduct of respiration. Butane and isobutane are both hydrocarbons that are found in natural gas. However, they are not major constituents of gobar gas.

Here is a brief explanation of each option:

• Option A: Carbon dioxide is a greenhouse gas that is produced when organic matter is burned. It is also a byproduct of respiration. Carbon
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  dioxide is not a major constituent of gobar gas.
• Option B: Methane is a colorless, odorless, and flammable gas. It is the primary component of natural gas and is also a major constituent of gobar gas.
• Option C: Butane is a hydrocarbon that is found in natural gas. However, it is not a major constituent of gobar gas.
• Option D: Isobutane is a hydrocarbon that is found in natural gas. However, it is not a major constituent of gobar gas.