Which one of the following fuels produces least environmental pollution?

The correct answer is (a) Hydrogen.

Hydrogen is a clean-burning fuel that produces no emissions. It is also the most abundant element in the universe, making it a sustainable option for the future.

Power alcohol is a fuel made from ethanol, which is a type of alcohol produced from plant materials. Ethanol is a renewable fuel that produces fewer emissions than gasoline. However, it is not as clean-burning as hydrogen and can contribute to air pollution.

Petrol is

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