JEE Main 2002 Chemistry question

Chemistry General Principles and Processes of Isolation of Elements (Metallurgy)JEE Main 2002

Not in JEE Main or NEET syllabus

Aluminium is extracted by the electrolysis of

(1)bauxite
(2)alumina
(3)alumina mixed with molten cryoliteCorrect
(4)molten cryolite

Answer: (3)

Solution

In the Hall–Héroult process, purified alumina () is dissolved in molten cryolite (), which lowers the melting point (from about 2050°C to about 950°C) and increases

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Question ID VK-037962