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AI can be obtained by

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AI can be obtained by
A. electrolysis of `AI_(2)O_(3)` dissolved in `Na_(3)AIF_(6)`
B. heating alumina with cryolite
C. reducing `AI_(2)O_(3)` by coke
D. reducing `AI_(2)O_(3)` by chromium
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(a) AI can be obtained by electrolysing `AI_(2)O_(3)` dissolved in `Na_(3)AIF_(6).`
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