In the purification of bauxite by Hall's process - Vidyadip

MCQ

In the purification of bauxite by Hall's process

A
Bauxite ore is heated with $NaOH$ solution at ${50\,^o}C$
✓
Bauxite ore is fused with $N{a_2}C{O_3}$
C
Bauxite ore is fused with coke and heated at ${1800\,^o}C$ in a current of nitrogen
D
Bauxite ore is heated with $NaHC{O_3}$

✓

Answer

Correct option: B.

Bauxite ore is fused with $N{a_2}C{O_3}$

b
(b)In Hall’s process

$A{l_2}{O_3}.2{H_2}O + N{a_2}C{O_3} \to 2NaAl{O_2} + C{O_2} + 2{H_2}O$

$2NaAl{O_2} + 3{H_2}O + C{O_2}\xrightarrow{{333\,K}}$ $2Al{(OH)_3} \downarrow + N{a_2}C{O_3}$

$2Al{(OH)_3}\xrightarrow{{1473\,K}}A{l_2}{O_3} + 3{H_2}O$

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