Aluminium is obtained by

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Question

Aluminium is obtained by electrolising alumina dissolved in cryolite $\left( Na _3 AlF _6\right)$

$4 Na _3 AlF _6 \leftrightharpoons 12 Na ^{+}+4 Al

Vedclass · Accepted Answer

Electrolysing $A{l_2}{O_3}$ dissolved in $N{a_3}Al{F_6}$

Vedclass · Answer

Aluminium is obtained by electrolising alumina dissolved in cryolite $\left( Na _3 AlF _6ight)$

$4 Na _3 AlF _6 \leftrightharpoons 12 Na ^{+}+4 Al ^{3+}+12 F ^{-}$

$4 Al ^{3+}+12 e ^{-} ightarrow 4 Al 	ext { (at cathode) }$

$12 F ^{-} ightarrow 6 F _2+12 e ^{-} 	ext {(at anode) }$

$2 Al _2 O _3+6 F _2 ightarrow AlF _3+3 O _2$

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