Question

In Hall's process the ore is leached by heating it with .

• A. sodium carbonate
• B. sodium bicarbonate
• C. sodium hyroxide

Answer 1

The correct option is A sodium carbonate

In Hall's process the powdered ore is leached by heating it with sodium carbonate to form sodium aluminate. The reaction involved is:
${\text{Al}}_2{\text{O}}_3.{\text{H}}_2\text{O(s)}+{\text{Na}}_2{\text{CO}}_3\text{(aq)}\to 2{\text{NaAlO}}_2\text{(aq)}+{\text{CO}}_2\text{(g)}+{\text{H}}_2\text{O(l)}$