Question:

Zone refining is used for the

Updated On: Jul 7, 2022
  • concentration of an ore
  • reduction of metal oxide
  • purification of a metal
  • purification of an ore
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The Correct Option is C

Solution and Explanation

Zone Refining (Fractional Crystallisation): This method is employed to get metal of very high purity i,e. ultra pure samples of $Ge Si , B , Ga$, In. This method is based on the fact that impurities are more soluble than the pure metal in the melt.
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Concepts Used:

General Principles and Processes of Isolation of Elements

What are Ores and Minerals? 

Minerals are the naturally occurring, homogeneous inorganic solid substances. They are having a definite chemical composition and crystalline structure, hardness and color. For example, copper pyrite, calamine, etc.

Impurities in an ore are called gauge. The removal of a gauge from the ore is called concentration ore. 

Several steps are involved in the extraction of pure metal from ores. Major steps are as follows –

  • Concentration of the ore
  • Isolation of the metal from its concentrated ore
  • Purification of the metal