Blister copper obtained during extraction from cuprous oxide is called so because:

it has blister like eruptions due to evolution of gas

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it has a shining surface like blister

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it is the most impure form of copper

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its surface is uneven due to different thickness at different place

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Solution

The correct option is A it has blister like eruptions due to evolution of gas
The various reaction involved in extraction of copper from cuprous oxide are:
$2 F e S + 3 O_{2} \to 2 F e O + 2 S O_{2}$
$F e O + S i O_{2} \to F e S i O_{3}$
$2 C u_{2} S + 3 O_{2} \to 2 C u_{2} O + 2 S O_{2}$
$2 C u_{2} O + C u_{2} S \to 6 C u + S O_{2}$
The solidified copper obtained has blistered appearance due to the evolution of $S O_{2}$ and so it is called blister copper.

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S O_{2}

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Which process is used to purify blister copper during the extraction of pure copper from chalcopyrite?

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