Question

The method of zone refining of metals is based on the principle of

Solution

Correct option is

Greater solubility of the impurity in the molten state than in the solid

The method of zone refining of metals is based on the principle of greater solubility of the impurity in the molten state than in the solid. Elements which are used as semiconductors like Si, Ge, Ga etc are refined by this method.

SIMILAR QUESTIONS

Q1

 

When copper pyrites is roasted in excess of air, a mixture of CuO + FeO is formed. FeO is present as impurities. This can be removed as slag during reduction of CuO. The flux added to form slag is

Q2

Willemite is

Q3

The temperature of the slag zone in the metallurgy of iron using blast furnace is

Q4

The ore that is concentrated by froth floatation process is

Q5

Native silver metal forms a water soluble complex with a dilute aqueous solution of NaCN in the presence of

Q6

Which of the following factors is of no significance for roasting sulphide ores to the oxidexs and not subjecting the sulphide ores to carbon reduction directly?

Q7

Calamine is

Q8

Extraction for zinc from zinc blende is achieved by

Q9

Which one of the following ores is best concentrated by froth-floatation method?

Q10

The mass of carbon anode consumed (giving only carbon dioxide) in the production of 270 kg of aluminium metal from bauxite by the Hall process is (Atomic mass of Al = 27)