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- Engineering
- I have a doubt, kindly clarify. Aluminium is extracted from alumina (Al2O3) by electrolysis of a molten mixture of:
- #AIPMT 2012 ( Prelims )
- #General Principles and processes of Isolation Elements
- #Engineering
- #Chemistry
Aluminium is extracted from alumina (Al2O3) by electrolysis of a molten mixture of:
- Option 1)
Al2O3+HF+NaAlF4
- Option 2)
Al2O3+CaF2+NaAlF4
- Option 3)
Al2O3+Na3AlF6+CaF2
- Option 4)
Al2O3+KF+Na3AlF6
Answers (1)
Fluorspar (CaF2) and Cryolite (Na3•AlF6) lower the melting point of alumina (Al2O3) and make it more conducting which is a lead conductor of electricity and has a high melting point.
Option 1)
Al2O3+HF+NaAlF4
This is incorrect option
Option 2)
Al2O3+CaF2+NaAlF4
This is incorrect option
Option 3)
Al2O3+Na3AlF6+CaF2
This is correct option
Option 4)
Al2O3+KF+Na3AlF6
This is incorrect option
View full answer
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