If a metal has low oxygen affinity,then the purification of the metal may be carried out by:

The Orford process is used in the extraction of

$A$ metal which is refined by poling is

The pair of metals refined by "vapour phase refining" is

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

Write the chemical equations for the $Van$ $Arkel$ method used for the refining of $Zr$ and $Ti$.