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.

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

Which is true for Column Chromatography ?

Which of the following metal is refined by poling method?

In the electrolytic refining of copper, $\mathrm{Ag}$ and $\mathrm{Au}$ are found :-

Which of the following correctly matched

(a) Monds process - $\mathrm{Ni}$
(b) Zone Refining - $\mathrm{Ti}$
(c) Hoop's Method - $\mathrm{Al}$
(d) Hydro metallurgy - $\mathrm{Ag}$

Match the elements in Column I with methods of purification in Column II.

Brine is electrolysed by using inert electrodes. The reaction at anode is: