How many of the following can be purified by using zone refining method?
$Ni, B, Ti, In, Ge, Mn, Ag, Si, Ga$

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

Thermal decomposition of which of the following yields nickel?

The zone refining method is based on which principle?

Write two basic requirements for refining of a metal by Mond's process and by Van Arkel Method.

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