Question
Question: Match the refining methods (Column I) with metals (Column II) Column I(Refining methods)| Col...
Match the refining methods (Column I) with metals (Column II)
| Column I(Refining methods) | Column II(Metals) |
|---|---|
| I | Liquation |
| II | Zone refining |
| III | Mond Process |
| IV | Van arkel method |
A. I-b, II-c, III-d, IV-a
B. I-c, II-a, III-b, IV-d
C. I-b, II-d, III-a, IV-c
D. I-c, II-d, III-b, IV-a
Solution
. Refining of metals includes the purification of metals, in an easy language we can say that refining is the process of obtaining pure metal from the impure form of metal. There are several methods of refining like distillation, liquation, electrolytic refining, zone refining etc.
Complete step by step answer:
Refining is generally used to purify metals. There are many methods of refining let us describe the methods gives in options:
A. Liquidation: In this process components or ore or alloy of a crude material is separated by partial melting. During this process, metal having low melting point melts by passing heat while the impurities having high boiling point remain solid. This method helps in refining tin (Sn), silver (Ag) and copper (Cu).
B. Zone refining: In this process rod of impure metal is inserted inside a tuber zone refiner and a circular heater stays around the impure metal and heater moves from one end to another along the rod and impurities also get shifted to the zone with molten metal. Finally impurities fixed at one end of the metal rod. Metals purified in zone refining are Ga, Si, In, Ge, B etc.
C. Mond process: This method is generally used to purify Ni. This process converts nickel oxides into nickel metal with very high purity being attainable in just a single process.
D. Van arkel method: This process is mainly used in purification of Ti and Zr. Impure Ti/Zr is heated in an evacuated vessel with iodine. It reacts with iodine and forms volatile titanium tetra iodide/ Zirconium tetraiodide then it is heated with W-filament and we get the pure metal.
Hence from the above discussion we can conclude that order given in option D is correct.
So, the correct answer is “Option D”.
Note: Other than these four methods there are many other methods are present out of which distillation is the common method but this method has some disadvantages that out of two one is lost due to its volatile nature so to reduce the loss of metals new methods like zone refining, van arkel methods are used.