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Easily oxidised impurities cause ___________

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Easily oxidised impurities cause ___________

(a) Moisture formation

(b) Nitrogen formation

(c) Sludge formation

(d) Ash formation

The question was asked in an online interview.

This question is from Classification of Lubricants topic in section Lubricants of Applied Chemistry

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Right choice is (c) Sludge formation

Easiest explanation: The easily oxidisable impurities cause the sludge formation. During the operating conditions, the asphaltic. Napthatic compounds will allows to form the sludge. As they decompose at high temperatures to cause the formation of carbon also.

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