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Q.

Blister copper is:

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a

impure copper

b

obtained in self reduction process during bessemerisation

c

both (a) and (b) are correct

d

none is correct

answer is C.

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Detailed Solution

The solidified copper obtained after bessemerisation is impure and contains Fe, Ni, Zn, Au, etc., as impurity. It has blistered like appearance due to the evolution of SO2 and so it is called blister copper.

2Cu2O+Cu2S6Cu+SO2

In sand moulds where the molten metal is cooling, SO2 is released. The "Blister copper" metal, which is 98% pure, is a form of impure copper.

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