Essential Chemistry for IGCSE - Electricity And Chemistry (Section 8 - No. 7)
What process is used to purify the bauxite ore before extracting aluminum?
Heating with carbon.
Electrolysis.
Reaction with sodium hydroxide followed by filtration.
Adding cryolite.
Explanation
The bauxite ore is first crushed and mixed with sodium hydroxide. Then the aluminum oxide reacts and the impurities are filtered off.
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