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99% of grease is produced from __________

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99% of grease is produced from __________

(a) petroleum oil

(b) olive oil

(c) castor oil

(d) whale oil

I have been asked this question during an interview for a job.

The doubt is from Classification of Lubricants topic in chapter Lubricants of Applied Chemistry

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The correct choice is (a) petroleum oil

The explanation is: The semi-solid lubricants are generally made by incorporation of the lubricating oil with metallic soap to the liquid lubricants. 99% of the grease is produced from the petroleum oil. Olive oil, castor oil and whale oil are the types of liquid lubricants.

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