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The corrosion problems are caused by _________ in lubricating oil.

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The corrosion problems are caused by _________ in lubricating oil.

(a) Potassium chloride

(b) Naphthenic acid

(c) Sodium chloride

(d) Carbon dioxide

The question was posed to me in an interview.

This question is from Neutralization/Acidic Number in division Lubricants of Applied Chemistry

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The correct answer is (b) Naphthenic acid

Explanation: The corrosion problems are due to the presence of the naphthenic acid that is why the acid number alone cannot give about the corrosion nature as it cannot give about the amount of naphthenic acid present.

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