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Questions
Outline the principles of refining of metals by the following methods: Vapour phase refining
Write the principles of Vapour phase refining methods
Solution 1
Vapour phase refining : -
Vapour phase refining is the process of refining metal by converting it into its volatile compound and then, decomposing it to obtain a pure metal. To carry out this process,
(i) the metal should form a volatile compound with an available reagent, and
(ii) the volatile compound should be easily decomposable so that the metal can be easily recovered.
Nickel, zirconium, and titanium are refined using this method.
Solution 2
Vapour phase refining: In this process, the impure metal is converted into its volatile compound, which is decomposed to obtain the pure metal.
The basic requirements for the vapour phase refining are:
(a) The metal should form a volatile compound with an available reagent.
(b) The volatile compound should decompose easily so that pure metal should be recovered.
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Write the principle behind the following methods of refining:
Vapour-phase refining
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Name the method of refining which is Used to obtain semiconductor of high purity.
Electrolytic refining is used to purify which of the following metals?
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.
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.
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Electrolytic reduction method is used for the extraction of ______.
Refining using liquation method is the most suitable for metals with ______.
Describe a method for refining nickel.
Describe a method for refining nickel.
