Aluminium is obtained by- \( \mathrm{P} \) W (A) Reduction of \( \m...

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Aluminium is obtained by-
\( \mathrm{P} \)
W
(A) Reduction of \( \mathrm{Al}_{2} \mathrm{O}_{3} \) with coke
(B) Electrolysis of \( \mathrm{Al}_{2} \mathrm{O}_{3} \) dissolved in \( \mathrm{Na}_{3} \mathrm{AlF}_{6} \)
(C) Reduction of \( \mathrm{Al}_{2} \mathrm{O}_{3} \) with chromium
(D) Heating cryolite and alumina
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