JEE Main Chemistry question

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

Not in JEE Main or NEET syllabus

In extraction of aluminium the electrolyte is

(A)Fused cryolite with felspar
(B)Pure alumina in molten state
(C)Fused cryolite with fluorspar
(D)Pure alumina dissolved in molten cryoliteCorrect

Answer: (D)

Solution

In the Hall–Héroult process, purified alumina is dissolved in molten cryolite () to lower the melting point and increase conductivity, and this alumina–cryolite melt is electrolysed. Pure molten alumina alone (B)

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Question ID VK-138330