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(B) The extraction of metals from their ores involves several steps such as concentration,roasting/calcination,reduction,and refining.$A$. $ZnCO_3 \ri

Vedclass · Accepted Answer

$CuFeS_2$ $\rightarrow$ $Cu$ (Pure)

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(B) The extraction of metals from their ores involves several steps such as concentration,roasting/calcination,reduction,and refining.$A$. $ZnCO_3 \rightarrow Zn$ involves calcination followed by reduction ($2$ steps).$B$. $CuFeS_2 \rightarrow Cu$ involves concentration,roasting,smelting,bessemerization,and electrolytic refining (more than $2$ steps).$C$. $PbS \rightarrow Pb$ involves roasting followed by reduction ($2$ steps).Since $CuFeS_2$ extraction involves multiple complex steps including concentration,roasting,smelting,and refining,it clearly involves more than two metallurgical processes.

List-$I$	List-$II$
$(P). [M(CN)_2]^-$	$(1). Ni$ (during refining of metal)
$(Q). [M(CO)_4]$	$(2). Ti$ (during refining of metal)
$(R). MI_4$	$(3). Pb$ (during roasting of ore)
$(S). MO$	$(4). Ag$ (during leaching of ore)

Column-$I$	Column-$II$
$P$. Nitriding	$I$. Process of heating steel to redness and then cooling it very slowly
$Q$. Annealing	$II$. Process of heating steel in presence of $NH_3$ and producing hard coating of Iron Nitride on the surface of steel
$R$. Tempering	$III$. Process of heating steel to redness and then cooling it suddenly by plunging it into water or oil
$S$. Quenching	$IV$. Process of heating quenched steel to a temperature well below redness and then cooling it slowly

Which of the following changes involve more than two metallurgical processes?

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