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Darkening of the oil colour takes place due to ________

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Darkening of the oil colour takes place due to ________

(a) Oxidation

(b) Reduction

(c) Hydrolysis

(d) Catalysis

I have been asked this question in an interview for job.

This intriguing question comes from Neutralization/Acidic Number topic in chapter Lubricants of Applied Chemistry

1 Answer

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Right option is (a) Oxidation

For explanation I would say: The darkening of the oil colour is due to the oxidation. On oxidation the formation of all soluble alcohols, ketones, acids and peroxides are produced. There by increasing the acid number, viscosity and darkening of the oil colour.

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