A) Electrolysing fused \[A{{l}_{2}}{{O}_{3}}\] and cryolite
B) By heating \[A{{l}_{2}}{{O}_{3}}\] with carbon
C) By heating \[A{{l}_{2}}{{O}_{3}}\] in Muffle furnace
D) By a process called pyrometallurgy
Correct Answer: A
Solution :
Aluminium metal is obtained by electrolyzing alumina, \[A{{l}_{2}}{{O}_{3}}\] fused with cryolite, \[NaAl{{F}_{6}}\]. Here, cryolite is used to increase the conductivity of alumina and to decrease its fusion temperature.
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