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Which of the following natural gas has the highest ignition temperature?

(a) Natural gas obtained from oil fields

(b) Natural gas obtained from coal fields

(c) Natural gas obtained from rocks

(d) Natural gas obtained from sea

I had been asked this question in an online interview.

I need to ask this question from Gaseous Fuels in division Fuels and Combustion of Engineering Chemistry II

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Right choice is (c) Natural gas obtained from rocks

Explanation: The natural gas produced from rocks by the diffusion of oil constituents a gas field that may be under high pressure. Due to this high pressure, the flow potential of gas increase, which produces static electricity and increases the ignition temperature which is hazardous for us.

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