Smoke emitted by chemical and paper factories, refineries, etc., can be reduced by using _______.

Coal

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Petrol

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Gas

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None of these

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Solution

The correct option is C Gas
Smoke emitted by chemical and paper factories, refineries etc., can be reduced by using gas instead of coal and petrol. This is because coal and petrol are carbonaceous fossil fuels with high carbon content which is emitted on burning coal and petroleum. This can be far reduced by using gases like biogas etc.

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