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Which of the following has no acid value?

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Which of the following has no acid value?

(a) Cotton seed oil

(b) Rape seed oil

(c) Whale oil

(d) Hard oil

I had been asked this question during an online interview.

Question is from Saponification Value topic in section Lubricants of Applied Chemistry

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The correct answer is (d) Hard oil

The explanation: Hard oil has no acid value. Cotton seed oil has the acid value of 194-195. Rape seed oil has low acid value that is about 1.4-4.0. The whale oil has the acidic value of 0.3-51.4.

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