In the electrolytic purification of copper,some gold is found in the:

Give two requirements for vapour phase refining.

Explain the zone refining process or explain refining by fractional crystallization.

The solubilities of the impurities in the melt and solid states are not the same. This principle is applied during the extraction of boron. This method is known as:

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

The zone refining method is used for the purification of which of the following?