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The lubricating oils must be refined to remove ___________

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The lubricating oils must be refined to remove ___________

(a) Wax

(b) Hydrocarbons

(c) Nitrogen

(d) Oxygen

This question was addressed to me in semester exam.

This intriguing question comes from Classification of Lubricants in division Lubricants of Applied Chemistry

1 Answer

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The correct choice is (a) Wax

The explanation is: The lubricating oils must be refined to remove the compounds like wax, aromatic compounds and asphaltic compound. If these compounds are not removed then they will be crystallize and stops the flow of lubricating oil.

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