MEDIUMMCQ SINGLEJEE Mains ChemistryInorganic ChemistryMetallurgyExtraction of Aluminium

Cryolite is:

A.Na₃AlF₆ and is used in the electrolysis of

B.Na₃AlF₆ and is used in the electrolysis✓ Correct

C.Na₃AlF₆ and is used in the electrolytic

D.Na₃AlF₆ and is used in the electrolysis of

Explanation

Cryolite is a sodium-aluminium-fluorine mineral. Its chemical formula is. 3 6 Na AlF In the Bayer’s process, aluminium oxide is obtained which has a very high melting point of around 2045 degree Celsius. To lower the melting point, a METALLURGY 40 synthetic cryolite, 3 6 Na AlF is used as a solvent. It reduces the melting point to around 970 degree Celsius and makes the electrolysis easier. Therefore, the correct answer is option (b) 3 6 Na AlF and is used in the electrolysis of alumina for lowering the melting point of alumina.

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