Question

Aluminium is extracted from alumina by electrolysis of a molten mixture of

Answer 1

Explanation:

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Al2O3 + Na3AlF6 + CaF2'

Electrolytic mixture contains alumina (Al2O3), cryolite (Na3AlF6) and fluorspar (CaF2) in the ratio of 20 : 40 : 20. Due to presence of these conductivity of alumina increases and fusion temperature decreases from 2000°C to 900°C.

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Answer 2

Answer:

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• Alumina, Al2O3 is a bad conductor of electricity and has very high melting point, so before subjecting to electrolysis, it is mixed with fluorspar (CaF2) and cryolite (Na3AlF6), which lower its melting point and make it more conducting

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