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Extraction of aluminium be understood by...

Extraction of aluminium be understood by :

Electrolytic reduction `Al_(2)O_(3)` :
Electrolyte : `Al_2O_(3) + "Cryolite" + CaF_2`
Carthode : Carbon inside the Fe container
Anode : Graphite rods
The molten electrolytes contain `Na^+, Al^(3+), "and" Ca^(2+)` but only Al gets deposited at cathode because,

A

Standard reduction potential of Al is more than that of Na and Ca

B

Standard oxidation potential of Al is more than that of Na and Ca

C

Graphite reacts only with `Al^(3+)` and not withi `Na^+` and `Ca^(2+)`

D

Discharge potential of `Al^(3+)` is higher than `Na^+` and `Ca^(2+)`

Text Solution

Verified by Experts

The correct Answer is:
A
Standard reduction potential of Al is more than that of Na and Ca
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