The solid copper obtained from copper matte has blistered appearance. It is due to

evolution of

S O_{2}

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impurities of

F e S

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impurities of

F e O

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evolution of

N O_{2}

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Solution

The correct option is A evolution of $S O_{2}$
Copper matte is charged with silica lined convertor with addition of some silica followed by hot air blast to convert remaining $F e S, F e O$ and $C u_{2} S / C u_{2} O$ to $C u$ .

$2 F e S + 3 O_{2} \to 2 F e O + 2 S O_{2} F e O + S i O_{2} \to F e S i O_{3} (slag) 2 C u_{2} S + 3 O_{2} \to 2 C u_{2} O + 2 S O_{2} 2 C u_{2} O + C u_{2} S \to 6 C u + S O_{2}$

The solid copper obtained has blistered appearance due to evolution of $S O_{2}$ . This copper is called blister copper.

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Solidified $C u$ obtained from the reverberatory furnace has blistered appearance. This is due to:

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