Cryolite,Na3AlF6 is used in the electrolysis of aluminum oxide because
A) it is a good source of fluoride ions.
B) it provides a source of fluorine,an oxidizing agent.
C) it provides a source of sodium,a reducing agent.
D) it reduces the energy requirement of the process,by lowering the melting point.
E) it is very soluble in water.
Correct Answer:
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