1.

Extraction of aluminumcan beunderstoodby The molten electrolytes contains Na^(+), AI^(3+), Ca^(2+) but only AI gets deposited at cathode because :

Answer»

STANDARD reduction POTENTIAL of AI is more than those of Na & Ca
Standard oxidation potential of AI is more than those of Na & Ca
Disharge potential `AI^(3+)` is HIGHER than `Na^(+) & Ca^(2+)`
Graphite reacts only with `AI^(3+)` and not with `Na^(+) & Ca^(2+)`

Solution :It is a fact.
Hence, (A) is the correct answer.


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