Question

Choose the incorrect statement:-

• A. We are encouraged to plant more trees so as to ensure a clean environment and also provide bio-mass fuel.
• B. Gobar-gas is produced when crops, vegetable wastes, etc., decompose in the absence of oxygen.
• C. The main ingredient of bio-gas is ethane and it gives a lot of smoke and also produces a lot of residual ash.
• D. Bio-mass is a renewable source of energy.

Answer 1

The correct option is C

The main ingredient of bio-gas is ethane and it gives a lot of smoke and also produces a lot of residual ash.

The correct option is C.

Explanation of the correct option:

Option C:

1. Biogas is a mixture of gases made from raw materials such as agricultural waste, manure, municipal trash, plant material, sewage, green waste, and food waste.
2. The main gases in biogas are methane, carbon dioxide, and hydrogen sulfide.
3. The main ingredient of biogas is methane.
4. It burns without smoke and leaves no residual ash.

Explanation of the incorrect options :

Option A :

1. In order to have a pollution-free environment, we should plant more trees.
2. It provides bio-mass fuel.
3. By encouraging people to plant more trees, we can ensure that the environment is clean and pollution-free and that biomass fuel is available.

Option B :

1. Gobar gas is produced from the decomposition of crops, vegetable wastes, etc. in the absence of oxygen.
2. Cow dung, crops, vegetable wastes, etc., degrade in the absence of oxygen to produce gobar gas.

Option D :

1. Bio-mass is a living matter and is a renewable source of energy.
2. A clean, renewable energy source is biomass.
3. Since plant or algal biomass gets its initial energy from the sun, it can renew swiftly.
4. Municipal solid trash, trees, and crops are all readily available and may be managed responsibly.

Final answer: The incorrect statement is the main ingredient of bio-gas is ethane and it gives a lot of smoke and also produces a lot of residual ash.