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Question

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

A
sodium carbonate
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B
sodium bicarbonate
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C
sodium hyroxide
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Solution

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:
Al2O3.H2O(s)+Na2CO3(aq)2NaAlO2(aq)+CO2(g)+H2O(l)

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