German silver is an alloy of

Consider the following statements:
$(a)$ When the lead-silver alloy is rich in silver,lead is removed by the cupellation process.
$(b)$ Froth flotation can be applied for non-sulphide ores also using a suitable activator.
$(c)$ $PbSO_4 + H_2SO_4$ electrolyte is used for the refining of $Pb$ by electrolysis.
$(d)$ Any metal will not reduce the oxide of other metals which lie above it in the Ellingham diagram.
Using $'T'$ for true and $'F'$ for false statements in the given sequence,select the correct set of code.

The form of iron having the highest carbon content is

The electrochemical extraction of aluminum from bauxite ore involves:

Match List $I$ with List $II$.

List $I$	List $II$
$A$. Reverberatory furnace	$I$. Pig Iron
$B$. Electrolytic cell	$II$. Aluminum
$C$. Blast furnace	$III$. Silicon
$D$. Zone Refining furnace	$IV$. Copper

Mark the steel in which carbon percentage is highest.