A) \[A{{l}_{2}}{{O}_{3}}+N{{a}_{3}}Al{{F}_{6}}+Ca{{F}_{2}}\]
B) \[A{{l}_{2}}{{O}_{3}}+KF+N{{a}_{3}}Al{{F}_{6}}\]
C) \[A{{l}_{2}}{{O}_{3}}+HF+NaAl{{F}_{4}}\]
D) \[A{{l}_{2}}{{O}_{3}}+Ca{{F}_{2}}+NaAl{{F}_{4}}\]
Correct Answer: A
Solution :
Extraction of Al from\[A{{l}_{2}}{{O}_{3}}\]is made by electrolytic reduction of molten mixture of alumina \[(A{{l}_{2}}{{O}_{3}}),\] cryolite\[(N{{a}_{3}}Al{{F}_{6}})\]and fluorspar \[Ca{{F}_{2}}\]in the ratio of 20 : 40 : 20 respectively.
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