Which one of the following reactions does not occur during the extraction of copper?

Match List-$I$ with List-$II$ and select the correct answer using the codes given below the lists.

List-$I$	List-$II$
$I$. Cyanide process	$A$. Ultrapure $Ge$
$II$. Floatation process	$B$. Pine oil
$III$. Electrolytic reduction	$C$. Extraction of $Al$
$IV$. Zone refining	$D$. Extraction of $Au$

Among the following compounds,the number of those present in copper matte is $......$
$A.$ $CuCO_3$
$B.$ $Cu_2S$
$C.$ $Cu_2O$
$D.$ $FeO$

Which of the following alloys contains $Ni$ metal?

Among statements $(a)-(d),$ the correct ones are
$(a)$ Limestone is decomposed to $CaO$ during the extraction of iron from its oxides.
$(b)$ In the extraction of silver,silver is extracted as an anionic complex.
$(c)$ Nickel is purified by Mond's process.
$(d)$ $Zr$ and $Ti$ are purified by Van Arkel method.

What is the appropriate process for the extraction of lead from low-grade ore (impurity level is high)?