MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Inorganic 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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