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What are the steps involved in purifying copper? (In order of precedence)

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What are the steps involved in purifying copper? (In order of precedence)

(a) Smelting-Roasting-Converting

(b) Smelting-Converting-Roasting

(c) Converting-Roasting-Smelting

(d) Roasting-Smelting-Converting

The question was asked in an interview for job.

Origin of the question is Copper topic in section Metallurgical Industries of Chemical Technology

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Correct answer is (d) Roasting-Smelting-Converting

Explanation: Water is first removed by roasting. Steamed air is sent in to remove the volatile impurities. The final is conversion of matte.

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