The following fuels are burned in excess oxygen at constant pressure and temperature. Arrange these fuels in increasing order of the amount of energy released by them per kilogram on complete combustion.

Wood < Coal < Petrol < CNG

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Coal < Wood < CNG < Petrol

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Wood < Coal < CNG < Petrol

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Wood < Petrol < CNG < Coal

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Solution

The correct option is A Wood < Coal < Petrol < CNG

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