Which of the following metals is present in Brass,Bronze,and German silver?

German silver is an alloy of

Consider the following metallurgical processes:
$I$. Heating impure metal with $CO$ and distilling the resulting volatile carbonyl (b.p. $43 \ ^oC$) and finally decomposition at $150 \ ^oC - 200 \ ^oC$ to get the pure metal.
$II$. Heating the sulphide ore in air until a part is converted to oxide and then further heating in the absence of air to let the oxide react with unchanged metal sulphide.
$III$. Electrolysis of the molten electrolyte containing approximately equal amounts of the metal chloride and $NaCl$ to obtain the metal.
The processes used for obtaining magnesium,nickel and copper are respectively:

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 $a-b-c-d$.

The statement that is $NOT$ correct is:

Which of the following is correctly matched?