In the electrolytic refining of an impure metal,a rod of impure metal is used as the anode and a rod of pure metal is used as the cathode,and the aqueous solution of its salt is electrolyzed. Which of the following metals cannot be refined by this method?

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

Column $-I$	Column $-II$
$(i)$ Iron and copper	$(P)$ Poling
$(ii)$ Zirconium and Titanium	$(Q)$ Bessemerisation
$(iii)$ Lead and Tin	$(R)$ Van Arkel
$(iv)$ Copper and Tin	$(S)$ Liquation

Thermal decomposition of which of the following yields nickel?

In electrolytic refining,the impure metal is used to make:

Which of the following statements are correct related to metallurgy?
$A$. In electrolytic refining of copper,pure $Cu$ is used as anode.
$B$. Zone refining is based on the principle that impurities are more soluble in the melt than in the solid state of the metal.
$C$. $TiI_4$ upon heating will give pure $Ti$.
$D$. Very pure $Zr$ may be obtained by galvanisation.
$E$. In copper smelting,hot air is used to convert to $CuSO_4$.
The correct answer is

In the electrolytic refining of zinc,