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Question

Given below is the steps for extraction of Copper from its ore. Write the reactions involved.
(a) Roasting Copper (I) Sulphide.
(b) Reduction of Copper (I) oxide with Copper (I) sulphide

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Solution

a) Roasting of Copper (I) Sulphide ore:
2CuS(S) + 3O2(S) 2CuO(S) + 2SO2(g)
b) Reduction of Copper (I) oxide with Copper (I) sulphide:
2Cu2O + CuS 6Cu(S)+ SO2(g)
This reaction is known as auto- reduction.

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