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Osmotic Pressure

Why does copp...

Question

Why does copper obtained in the extraction from copper pyrites have a blistered appearance?

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Solution

The sulphur dioxide escaping from the melt gets trapped in the cooler parts of the molten copper surface gives a blistery appearance for copper and hence it is called blister copper.

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Q. (a) Write the principle of electrolytic refining.
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Q. Copper is extracted from copper pyrites. After roasting, the ore is mixed with silica and coke and then smelted in a blast furnace. The matte obtained from the blast furnace is charged into a silica lined converter. Some silica is also added and a hot air blast is thrown into the mixture to obtain blister copper which is purified by electrorefining.

During roasting, copper pyrites are ultimately converted into a mixture of:

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