MEDIUMMCQ SINGLEJEE Mains ChemistryInorganic ChemistryMetallurgyExtraction of Aluminium

Electrolytic reduction of alumina to aluminium by the Hall-Heroult process is carried out

A.in the presence of NaCl

B.in the presence of fluorite✓ Correct

C.in the presence of cryolite which forms a melt at

D.in the presence of cryolite which forms a melt at

Explanation

Alumina has very high melting point and is poor conductor of electricity so to increase the conductivity and reduce the melting point cryolite is added. 92. Cryolite is the ore of: (a) Al (b) Cu (c) Ag (d) Fe Ore is a material from which we can extract specific metals. Ores are those from which the metals are present in large amounts and extracted beneficially. The formula of cryolite is 3 6 Na AlF , so it is the ore of aluminium. 93. The metal which cannot be obtained by electrolysis of aqueous solution of its salt is (a) Ag (b) Zn (c) Cu (d) Al Wh

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