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Which of the following compound is used for fine polishing?

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Which of the following compound is used for fine polishing?

(a) Aluminum oxide

(b) Nitric oxide

(c) Silicon carbide

(d) Iron oxide

The question was asked in an online quiz.

Enquiry is from Destructive Testing topic in division Repair Technology for Concrete Structures of Concrete Technology

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The correct answer is (a) Aluminum oxide

Explanation: Powder form of aluminum oxide is used for fine polishing process. It is surface treatment process.

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