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Coke powderis spreaded over the molten e...

Coke powderis spreaded over the molten elctrolyte in electrolytic reduction of `Al_(2)O_(3)` in order to:

A

prevent in electrolytic redcution from the surface

B

prevent the corrosion of graphite anode.

C

prevent oxidation of molten aluminium by air.

D

Both a and b

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The correct Answer is:
D
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