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 $
