Type metal is an alloy of $Pb, Sb$ and $Sn$. It consists of

In aluminium extraction by the Bayer process, alumina is extracted from bauxite by sodium hydroxide at high temperature and pressure: $Al_2O_{3(s)} + 2 OH^-_{(aq)} + 3 H_2O_{(l)} \rightarrow 2 [Al(OH)_4]^-_{(aq)}$. Solid impurities such as $Fe_2O_3$ and $SiO_2$ are removed and then $[Al(OH)_4]^-$ is reprecipitated: $2 [Al(OH)_4]^-_{(aq)} \rightarrow Al_2O_3 \cdot 3 H_2O_{(s)} + 2 OH^-_{(aq)}$. In the industrial world:

Stainless steel is an alloy of

Identify the correct statements from the following:
$(i)$ In the extraction of $Ag$ and $Au$,zinc is used as a reducing agent.
$(ii)$ Impure zinc can be refined by distillation method.
$(iii)$ Malachite is an ore of nickel.

Match List-$I$ with List-$II$ (Both having metallurgical terms):

List-$I$	List-$II$
$A$. Concentration of $Ag$ ore	$I$. Reverberatory furnace
$B$. Blast furnace	$II$. Pig iron
$C$. Blister copper	$III$. Leaching with dilute $NaCN$ solution
$D$. Froth floatation method	$IV$. Sulfide ores

Choose the correct answer from the options given below:

One of the constituents of German silver is: