4. Least polluting fuel than petrol is...….....
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Explanation:
CNG is more polluting fuel than petrol. Coke is almost pure form of carbon. Coal tar is a mixture of various substances.
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NCERT Solution
They are more efficient.
They can be easily transported; either in cylinders or through pipelines.
They are less polluting than other fossil fuels.
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CNG OR Natural gas is least polluting than petrol
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