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(D) $1$. $Pb$ (Lead) is extracted from Galena $(PbS)$ primarily by self-reduction of its oxide $(PbO)$ with the remaining sulfide $(PbS)$.$2$. $Cu$ (C

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(D) $1$. $Pb$ (Lead) is extracted from Galena $(PbS)$ primarily by self-reduction of its oxide $(PbO)$ with the remaining sulfide $(PbS)$.$2$. $Cu$ (Copper) is refined using the poling process,where molten copper is stirred with green wood poles to reduce copper$(I)$ oxide $(Cu_2O)$ to copper metal.$3$. $Ag$ (Silver) is extracted via the Mac-Arthur Forrest cyanide process,which involves leaching silver ore with a dilute solution of $NaCN$ or $KCN$ in the presence of air.$4$. Since all these processes are standard metallurgical techniques for the respective metals,the correct option is $D$.

List-$I$	List-$II$
$A$. Bronze	$I$. $Cu, Ni$
$B$. Brass	$II$. $Fe, Cr, Ni, C$
$C$. $UK$ silver coin	$III$. $Cu, Zn$
$D$. Stainless Steel	$IV$. $Cu, Sn$

Select the correct option regarding the processes used during metal extraction from their ores.

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Which alloy contains $Cu$,$Sn$ and $Zn$?

Match List-$I$ with List-$II$.
List-$I$ List-$II$
$A$. Bronze $I$. $Cu, Ni$
$B$. Brass $II$. $Fe, Cr, Ni, C$
$C$. $UK$ silver coin $III$. $Cu, Zn$
$D$. Stainless Steel $IV$. $Cu, Sn$
Choose the correct answer from the options given below:

Brass is an alloy of copper and ......... .

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