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During refining the petroleum, in fractional distillation, what is the temperature in still?

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During refining the petroleum, in fractional distillation, what is the temperature in still?

(a) 800^oC

(b) 400^oC

(c) 300^oC

(d) 100^oC

I have been asked this question in semester exam.

I would like to ask this question from Mining of Petroleum in section Fuel Technologies of Applied Chemistry

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The correct answer is (b) 400^oC

Easiest explanation: The crude oil is distilled and later it is sent into the pre-heater or else it can be heated with steam, inside the still the temperature is about 400^oC.

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