Refining of Crude Metals

Which one of the following methods can be used to obtain highly pure metal which is liquid at room temperature?

Copper metal is refined by

Poling process involves:

Zone refining method is used for refining:

Name the method which is very useful for producing semiconductors.

In electrolytic refining, which metal is made anode?

State briefly the principle of refining by chromatography.

Write the principle of method used for the refining of germanium.

Write the principle of electrolytic refining.

Which methods are usually employed for purifying the Germanium metal ?

Which methods are usually employed for purifying the tin metal ?

A crude metal is heated with iodine to form metal tetraiodide which is decomposed on tungsten filament at $1800 \mathrm{K}$ to liberate pure metal. Give the name of this method.

Zone refining is based on the principle that ...

Which of the following options are correct?

(a) Cast iron is obtained by remelting pig iron with scrap iron and coke using hot air blast

(b) In extraction of silver, silver is extracted as cationic complex

(c) Nickel is purified by zone refining

(d) $\mathrm{Zr}$ and $\mathrm{Ti}$ are purifed by van Arkel method

Which of the following reaction does not represent correct method?

Vapour phase refining of nickel is carried out using

Purification of $\mathrm{Ge}$ like semiconductor is done by

A $\mathrm{d}-$block metal has no unpaired ${\mathrm{e}}^{-}$ in $\mathrm{d}-$subshell and has fully filled $\mathrm{s}$-orbital. Which method is most suitable for its refining?

Van-Arkel process and Mond's process are used for refining for which of the metals respectively.