Incorrect statement in electrolysis of by Hall-Heroult process is :

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Problem

Incorrect statement in electrolysis of

Al_2O_3

by Hall-Heroult process is : (1) Cryolite

Na_3[AlF_6]

lowers the m.pt. of

Al_2O_3

and increases its electrical conductivity (2) Al is obtained at cathode and

CO_2

at anode (3)

Li_2CO_3

can be used in place of cryolite (

Na_3AlF_6

) (4)

MgF_2

can be used in place of flourspare (

CaF_2

)