(a) Distinguish between ‘roasting’ and ‘calcination’. Which of these two is used for sulphide ores and why? (b) Write a chemical equation to illustrate the use of aluminium for joining cracked railway lines. (c) Name the anode, the cathode and the electrolyte used in the electrolytic refining of impure copper.

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Answers

2016-02-20T18:58:25+05:30

Roasting is a step of the processing of certain ores. More specifically, roasting is a metallurgical process involving gas–solid reactions at elevated temperatures with the goal of purifying the metal component.

calcination is heating to high temperature in air or oxygen.


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