P-Block Elements Ques 29

Question: In the purification of bauxite by Hall’s process

Options:

A) Bauxite ore is heated with $ NaOH $ solution at $ 50^{o}C $

B) Bauxite ore is fused with $ Na_2CO_3 $

C) Bauxite ore is fused with coke and heated at $ 1800^{o}C $ in a current of nitrogen

D) Bauxite ore is heated with $ NaHCO_3 $

Show Answer

Answer:

Correct Answer: B

Solution:

In Hall’s process

$ Al_2O_3.2H_2O+Na_2CO_3\to 2NaAlO_2+CO_2+2H_2O $ $ 2NaAlO_2+3H_2O+CO_2\xrightarrow{333K} $

$ 2Al{{(OH)}_3}\downarrow +Na_2CO_3 $ $ 2Al{{(OH)}_3}\xrightarrow{1473K}Al_2O_3+3H_2O $



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