MEDIUMMCQ SINGLEJEE Advanced ChemistryInorganic ChemistryMetallurgyExtraction of Aluminium

The major role of fluorspar (CaF₂) which is added in small quantities in the electrolytic reduction of alumina dissolved in fused cryolite (Na₃AlF₆) is

A.as a catalyst

B.to make the fused mixture very conducting

C.to increase the temperature of the melt✓ Correct

D.to decrease the rate of oxidation of carbon at the

Explanation

Aluminium is extracted from alumina by electrolysis. But the alumina is a bad conductor of electricity so the alumina is added with cryolite and fluorspar to increase the conductivity of the mixture and it also decreases the melting point of the mixture. 100. In the commercial electrochemical process for aluminium extraction, the electrolyte used as (a) Al(OH)₃ in NaOH solution (b) an aqueous solution of Al₂ (SO₄)₃ (c) a molten mixture of Al₂O₃ and Na₃AlF₆ (d) a molten mixture of AlO (OH) and Al (OH)₃ Aluminium is extracted from alumina by electrolysis. But the alumina is a bad conductor of el

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