JEE Advanced 2020 Chemistry question

Chemistry General Principles and Processes of Isolation of Elements (Metallurgy)JEE Advanced 2020

Which among the following statement(s) is(are) true for the extraction of aluminium from bauxite?

(A)Hydrated precipitates, when is bubbled through a solution of sodium aluminate.Correct
(B)Addition of lowers the melting point of alumina.Correct
(C) is evolved at the anode during electrolysis.Correct
(D)The cathode is a steel vessel with a lining of carbon.Correct

Answer: (A),(B),(C),(D)

Solution

(A) In Bayer's process bauxite is leached with NaOH to give sodium aluminate; passing neutralises the solution and hydrated alumina precipitates: – true. (B) In the Hall–Héroult process

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Question ID VK-033812