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Which of the following is a primary gaseous fuel?

(a) Water gas

(b) Oil gas

(c) Refinery gas

(d) Liquefied petroleum gas

This question was addressed to me in semester exam.

My question is based upon Gaseous Fuels topic in chapter Fuels and Combustion of Engineering Chemistry II

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The correct answer is (d) Liquefied petroleum gas

Easy explanation: Primary gaseous fuel are those, which are already present in nature and secondary gaseous fuels are those which are obtained from primary gaseous fuels. Natural gas is also a primary gaseous fuel.

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