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Match List-$I$ with List-$II$ (Both having metallurgical terms):
List-$I$ List-$II$
$A$. Concentration of $Ag$ ore $I$. Reverberatory furnace
$B$. Blast furnace $II$. Pig iron
$C$. Blister copper $III$. Leaching with dilute $NaCN$ solution
$D$. Froth floatation method $IV$. Sulfide ores

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Spiegeleisen is an alloy of

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What is known as Thomas slag?

Extraction of copper from copper pyrite $CuFeS_2$ involves:
$A$. Crushing followed by concentration of the ore by froth-flotation
$B$. Removal of iron as slag
$C$. Self-reduction step to produce 'blister copper' following evolution of $SO_2$
$D$. Refining of 'blister copper' by carbon reduction

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