Advertisements
Advertisements
Question
How are metals used as semiconductors refined? What is the principle of the method used?
Advertisements
Solution
Semiconducting metal is produced by zone refining method which is based on the principle that the impurities are more soluble in melt than in the solid state of metals.
APPEARS IN
RELATED QUESTIONS
Name the method used for the refining of zirconium.
Name the method of refining of metals such as Germanium.
What is the principle behind the zone refining of metals?
Outline the principles of refining of metals by the following method:
Vapour phase refining
Indicate the principle behind the method used for the refining of Nickel.
Outline the principles behind the refining of metals by the following methods:
Zone refining method
What happens when Silver is leached with NaCN in the presence of air?
What happens when Copper matte is charged into silica lined converter and hot air blast is blown?
Name the method of refining which is Used to obtain low boiling metal.
In which of the following method of purification, metal is converted to its volatile compound which is decomposed to give pure metal?
(i) Heating with stream of carbon monoxide.
(ii) Heating with iodine.
(iii) Liquation.
(iv) Distillation.
Write two basic requirements for refining of a metal by Mond process and by Van Arkel Method.
Which method is used for refining Zr and Ti? Explain with equation.
Match the items of Column I with the items of Column II and assign the correct code:
| Column I | Column II |
| (A) Coloured bands | (1) Zone refining |
| (B) Impure metal to volatile complex | (2) Fractional distillation |
| (C) Purification of Ge and Si | (3) Mond Process |
| (D) Purification of mercury | (4) Chromatography |
| (5) Liquation |
Assertion: Nickel can be purified by Mond process.
Reason: \[\ce{Ni(CO)4}\] is a volatile compound which decomposes at 460 K to give pure Ni.
Assertion: Zirconium can be purificed by Van Arkel method.
Reason: ZrI4 is volatile and decomposes at 1800 K.
Explain the following:
Vapour phase refining method is used for the purification of Ti.
Which one of the following methods can be used to obtain highly pure metal which is liquid at room temperature?
Describe a method for refining nickel.
Describe a method for refining nickel.
Describe a method for refining nickel.
