JEE Main Chemistry question

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

Not in JEE Main or NEET syllabus

In purification of bauxite by Hall's process

(A)Bauxite ore is fused with Correct
(B)Bauxite ore is heated with NaOH solution at
(C)Bauxite ore is heated with
(D)Bauxite ore is fused with coke and heated at in a current of nitrogen

Answer: (A)

Solution

In Hall's process, bauxite is fused with sodium carbonate: Al_2O_3.2H_2O + Na_2CO_3 \rightarrow 2NaAlO_2 + CO_2 + 2H_2O, and the resulting sodium aluminate is later hydrolysed to .

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Question ID VK-138328