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Aluminium is extracted from alumina by e...

Aluminium is extracted from alumina by electrolysis of amolten mixture of

A

`Al_2 O_3 + KF +NaAl_3 F_6`

B

`Al_2 O_3 + Na_3 AlF_6 + CaF_2`

C

`Al_2 O_3 +HF +Na_3 AlF_6`

D

`Al_2 O_3 + NaF+CaF_2`

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