What are the metals and their approximate percentages in German silver?

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

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

List-$I$	List-$II$
$(a)$ van Arkel method	$1$. Manufacture of caustic soda
$(b)$ Solvay process	$2$. Purification of titanium
$(c)$ Cupellation	$3$. Manufacture of $Na_2CO_3$
$(d)$ Poling	$4$. Purification of copper
$ $	$5$. Refining of silver

Codes :

List-$I$ shows reactions involved in the metallurgy of $Pb$ (lead) and List-$II$ shows the names of the processes. Match List-$I$ with List-$II$ and select the correct code for your answer.

List-$I$	List-$II$
$(P) \ PbS + 2PbO \xrightarrow{\Delta} 3Pb + SO_2 \uparrow$	$(1) \ \text{Smelting}$
$(Q) \ PbS + \frac{3}{2}O_2 \xrightarrow{\Delta} PbO + SO_2 \uparrow$	$(2) \ \text{Self reduction}$
$(R) \ PbCO_3 \xrightarrow{\Delta} PbO + CO_2 \uparrow$	$(3) \ \text{Calcination}$
$(S) \ PbO + C \xrightarrow{\Delta} Pb + CO \uparrow$	$(4) \ \text{Roasting}$

In the metallurgy of iron,when limestone is added to the blast furnace,the calcium ions end up in:

Match List-$I$ (Substances) with List-$II$ (Processes) used for their production.

List-$I$ (Substances)	List-$II$ (Processes)
$(a)$ Sulphuric acid	$(i)$ Haber process
$(b)$ Steel	$(ii)$ Bessemer process
$(c)$ Sodium hydroxide	$(iii)$ Leblanc process
$(d)$ Ammonia	$(iv)$ Contact process

Choose the correct option for $a-b-c-d$.