MEDIUMMCQ SINGLENEET ChemistryInorganic ChemistryMetallurgyPrevious Year Questions

Aluminium is extracted from alumina (Al₂O₃) by electrolysis of a molten mixture of (AIPMT 2012)

A.Al₂O₃ + HF + NaAlF₄

B.Al₂O₃ + CaF₂ + NaAlF₄

C.Al₂O₃ + Na₃AlF₆ + CaF₂✓ Correct

D.Al₂O₃ + KF + Na₃AlF₆

Explanation

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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