Advertisements
Advertisements
प्रश्न
Explain:
Zone refining
Outline the principles of refining of metals by the following method:
Zone refining
Advertisements
उत्तर
Zone refining: This method is based on the principle that impurities are more soluble in the molten state of metal (the melt) than in the solid state. In the process of zone refining, a circular mobile heater is fixed at one end of a rod of impure metal. As the heater moves, the molten zone of the rod also moves with it. As a result, pure metal crystallizes out of the melt, and the impurities pass onto the adjacent molten zone. This process is repeated several times, which leads to the segregation of impurities at one end of the rod. Then, the end with the impurities is cut off. Silicon, boron, gallium, indium, etc. can be purified by this process.
संबंधित प्रश्न
Name the method used for the refining of Nickel metal.
Name the method used for the refining of zirconium.
What is meant by the term “chromatography”?
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
Outline the principles behind the refining of metals by the following methods:
Chromatographic method
Write the principle behind the following methods of refining:
Vapour-phase refining
Name the method of refining which is Used to obtain semiconductor of high purity.
Name the method of refining which is Used to obtain low boiling metal.
In the extraction of chlorine from brine:
(i) ∆GΘ for the overall reaction is negative.
(ii) ∆GΘ for the overall reaction is positive.
(iii) EΘ for overall reaction has negative value.
(iv) EΘ for overall reaction has positive value.
Write two basic requirements for refining of a metal by Mond process and by Van Arkel Method.
Give two requirements for vapour phase refining.
Assertion: Zirconium can be purificed by Van Arkel method.
Reason: ZrI4 is volatile and decomposes at 1800 K.
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.
Describe a method for refining nickel.
