Explain the purification of Zirconium and Titanium metals.

Which method is used to obtain highly pure $Si$?

What is the process of refining aluminum by the electrolytic refining method called?

Which of the following elements is extracted using $I_2$ as the reactant?

Match the following items of List-$I$ with those of List-$II$:

List-$I$	List-$II$
$(A)$ Nickel	$(1)$ Electrolytic refining
$(B)$ Titanium	$(2)$ Zone refining
$(C)$ Germanium	$(3)$ van-Arkel method
$(D)$ Copper	$(4)$ Mond process

The correct answer is:

The formation of $Ni(CO)_4$ and its subsequent decomposition into $Ni$ and $CO$ forms the basis of the Mond process.
$Ni + 4CO$ $\xrightarrow{T_1} Ni(CO)_4$ $\xrightarrow{T_2} Ni + 4CO$
What are the values of $T_1$ and $T_2$?