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What happens when the crude petroleum fractions are made in contact of catalyst in cracking process?

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What happens when the crude petroleum fractions are made in contact of catalyst in cracking process?

(a) Solid substances are obtained

(b) Liquid substances are obtained

(c) Gaseous substances are obtained

(d) Solid, liquid and gaseous substances are obtained

I have been asked this question in examination.

My doubt stems from Cracking topic in section Fuels and Combustion of Engineering Chemistry II

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The correct choice is (d) Solid, liquid and gaseous substances are obtained

For explanation I would say: Gases, gasoline, coke and other liquid products are formed when a catalyst comes in contact with crude petroleum fractions in cracking process. This happens due to the various reactions such as dehydrogenation, isomerization etc.

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