JEE Main Chemistry question

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

Not in JEE Main or NEET syllabus

In the electrolytic method of obtaining aluminium from purified bauxite, cryolite is added to the charge in order to [AMU 2006]

(A)Minimise the heat loss due to radiation
(B)Protect aluminium produced from oxygen
(C)Dissolve bauxite and render it conductor of electricity
(D)Lower the melting point of bauxiteCorrect

Answer: (D)

Solution

Cryolite () is added to alumina to lower its very high melting point and also to increase the melt's electrical conductivity, making electrolysis practical at a much lower operating

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Question ID VK-138279