In the electrolysis of alumina to obtain aluminium metal, cryolite is added mainly to
- lower the melting point of alumina
- dissolve alumina in molten cryolite
- remove the impurities of alumina
- increase the electrical conductivity
The Correct Option is A
Solution and Explanation
Top Questions on General Principles and Processes of Isolation of Elements
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D. ClO2; is used as a bleaching agent
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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