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Extraction of Aluminium

i Name the mo...

Question

(i) Name the most common ore of the metal aluminium from which the metal is extracted. Write the chemical formula of the ore.
(ii) Name the process by which impure ore of aluminium gets purified by using concentrated solution of an alkali.
(iii) Write the equation for the formation of aluminium at the cathode during the electrolysis of alumina.

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Solution

(i) Bauxite is the most common ore of aluminium. Its chemical formula is $A l_{2} O_{3} .2 H_{2} O$

(ii) Bayer's process

(iii) Reaction at cathode:
${A l}^{3 +} (a q) + 3 e^{-} \to A l (s)$

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Q. The following is an extract from 'Metals in the Service of Man, Alexander and Street/Pelican 1976':
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Q. (i) Name the solution used to react with Bauxite as a first step in obtaining pure aluminium oxide, in the Baeyer's process.
(ii) Write the equation for the reaction where the aluminium oxide for the electrolytic extraction of aluminium is obtained by heating aluminium hydroxide.
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