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Extraction of Aluminiunt can be understo...

Extraction of Aluminiunt can be understood by :

Electrolytic reduction of `Al_(2)O_(3) :`
`{:("Electrolyte",:(Al_(2)O_(3)+"Cryolite")),("Cathode",:"Graphite inside the Fe container"),("Anode",:"Graphite rods"):}`
The molten electrolytes contains `Na^(+),Ca^(2+), Ca^(2+)` but only Al get deposited at cathode because :

A

standard reduction potential of Al is more than those of Na & Ca

B

Standard oxidation potential of Al is more than those of Na & Ca

C

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

D

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

Text Solution

Verified by Experts

The correct Answer is:
A
The discharge potential of `Al^(+1)` is less than `Na^(+) ,Ca^(+2) or` S.R.P. of Al is greater than Na, Ca.
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