JEE Advanced 2022 Chemistry question

Chemistry General Principles and Processes of Isolation of Elements (Metallurgy)JEE Advanced 2022

The electrochemical extraction of aluminum from bauxite ore involves

(A)the reaction of with coke (C) at a temperature > 2500 ºC.
(B)the neutralization of aluminate solution by passing gas to precipitate hydrated alumina ().Correct
(C)the dissolution of in hot aqueous NaOH.Correct
(D)the electrolysis of mixed with to give Al and .Correct

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

Solution

In Bayer's process bauxite is leached with hot aqueous NaOH ( dissolves as sodium aluminate) – (C) correct; the aluminate solution is neutralised with , precipitating hydrated alumina – (B) correct. In the Hall–Héroult process purified alumina dissolved in

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Question ID VK-034000