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Cupellation and Poling

The solubilit...

Question

The solubility of impurities in a metal in molten and solid states is different. This is principle involved in the refining of a metal by which of the following methods?

A

Poling

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B

Liquation

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C

Zone refining

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D

Electrolysis

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Solution

The correct option is D Zone refining
Zone refining is based upon fractional crystallization as the impurity prefers to stay in the melt and on solidification, only pure metals solidify on the surface of the melt.
In this process, solubility of the impurities in the metal in molten and solid states is different.

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Q. Zone refining is based on the principle that the impurities are more soluble in the melt than in the solid metal.

Zone refining is based on the principle of that the impurities tend to be in the melt than in the solid metal.

Q. Describe the principle involved in each of the following process of metallurgy.
a) Froth Floatation method
b) Electrolytic Refining of Metals
c) Zone refining of Metal

Q. (I) When copper ore is mixed with silica, in a reverberatory furnace copper matte is produced. The copper matte contains sulphides of copper (II) and iron (II).
(II) Zone refining is based on the principle that impurities are more soluble in molten metal than in solid metal.
(III) In the metallurgy of aluminium, graphite anode is oxidised to carbon monoxide and carbon dioxide.
Correct statements amongs the following are:

Q. Mark the correct statements:

(i) mercury can be refined by the process of distillation.

(ii) In poling, the molten impure metal is stirred with green poles of wood.

(iii) In electrolyte refining of metals, impure metal is made as cathode and a thin strip of pure metal is made as anode.

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