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प्रश्न
Explain the following:
Vapour phase refining method is used for the purification of Ti.
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उत्तर
In the process of vapour refining an impure metal is treated with a suitable reagent to form volatile compound which is decomposed at high temperature to get pure metal. Here, Ti can form volatile compound (I1I4) with the iodine and the compound is easily decomposable to give extra pure Ti. So, the recovery is easy.
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संबंधित प्रश्न
Name the method used for the refining of zirconium.
Explain column chromatography.
Outline the principles of refining of metals by the following method:
Vapour phase refining
Describe ‘froth floatation process’ for concentration of sulphide ore.
Write the chemical equations involved in van Arkel method for refining zirconium metal.
Indicate the principle behind the method used for the refining of Nickel.
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
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.
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: Zone refining method is very useful for producing semiconductors.
Reason: Semiconductors are of high purity.
Purification of crude metals by removing metallic and non-metallic impurities is known as ______ of metals.
Electrolytic reduction method is used for the extraction of ______.
Describe a method for refining nickel.
Describe a method for refining nickel.
Describe a method for refining nickel.
Describe a method for refining nickel.
Describe a method for refining nickel.
