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The scales formed during the removal of harmful impurities can be removed by __________

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The scales formed during the removal of harmful impurities can be removed by __________

(a) electrolysis

(b) electroplating

(c) electrotyping

(d) dehydration

This question was posed to me in an online interview.

The question is from Mining of Petroleum in division Fuel Technologies of Applied Chemistry

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Right option is (d) dehydration

Explanation: The corrosion is will be there if there is presence of magnesium chloride or sodium chloride salts in crude oil and forms scales. These scales can be removed by dehydration process.

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