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In what forms are liquid fuels available in nature?

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In what forms are liquid fuels available in nature?

(a) Light distillate

(b) Petroleum spirit

(c) Petroleum naphtha

(d) Crude petroleum

The question was posed to me in unit test.

This interesting question is from Artificial Solid Fuels & Liquid Fuels topic in chapter Steam Power Plant of Energy Engineering

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The correct choice is (d) Crude petroleum

Explanation: Liquid fuels are available in nature in the form of crude petroleum. All commercial liquid fuels are derived from crude petroleum or crude oil. The crude oil, as it comes out from oil wells contains 83-87% carbon, 10-14% hydrogen and small percentages of sulfur, nitrogen, oxygen and gases containing mainly ethane and methane.

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