Blister copper obtained during the extraction of copper is so called because

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its surface is shining like blister

it is the most impure form of copper

it has blisters on its surface because of the evolution of SO2 gas

its surface 31, due to different thickness at different places

answer is C.

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Detailed Solution

The copper obtained from the Bassemer process, has blistered appearance because of the evolution of SO2 gas and so it is called blister copper.

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