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प्रश्न
Write two basic requirements for refining of a metal by Mond process and by Van Arkel Method.
उत्तर
Two basic requirements for both processes are:
(i) The metal should form a volatile compound with an available reagent.
(ii) The volatile compound should be easily decomposable, so that recovery of metal is easy.
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संबंधित प्रश्न
What is the principle behind the zone refining of metals?
Explain the principle of the method of electrolytic refining of metals. Give one example.
What is meant by the term “chromatography”?
Describe ‘froth floatation process’ for concentration of sulphide ore.
Write the principle behind the following methods of refining:
Vapour-phase refining
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: Zone refining method is very useful for producing semiconductors.
Reason: Semiconductors are of high purity.
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.
