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Standard XII
Chemistry
Question

________ can be obtained from bauxite by ______.
  1. Aluminium, Electrolysis
  2. Copper, Electroplating
  3. Aluminium, Electroplating
  4. Copper, Electrolysis

A
Copper, Electroplating
B
Aluminium, Electrolysis
C
Aluminium, Electroplating
D
Copper, Electrolysis
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Solution
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Aluminium can be obtained from bauxite by Electrolysis.
Bauxite is ore of Aluminium and Electrolysis is done to purify aluminium

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Similar Questions
Q1

Aluminium is obtained by the electrolysis of molten aluminium oxide. A metal just below aluminium in the reactivity series can be extracted by which method easily:


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Q2

(a) The following is an extract from 'Metals in the service of Man, Alexander and Street/ Pelican 1976':
'Alumina (aluminium oxide) has a very high melting point of over 2000°C so that it cannot readily be liquefied. However, conversion of alumina to aluminium and oxygen, by electrolysis, can occur when it is dissolved in some other substance'.
(i) Which solution is used to react with bauxite as a first step in obtaining pure aluminium oxide?
(ii) The aluminium oxide for the electrolysis of aluminium is obtained by heating aluminium hydroxide. Write the equation for this reaction.
(iii) Name the element which serve both as the anode and the cathode in the extraction of aluminium.
(iv) Write the equation for the reaction that occurs at the cathode during the extraction of aluminium by electrolysis.
(v) Give the equation for the reaction which occurs at the anode when aluminium is purified by electrolysis.

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Q3
(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.
(iii) Name the compound added to pure alumina to lower the fusion temperature during the electrolytic reduction of alumina.
(iv) Write the equation for the reaction that occurs at the cathode during the extraction of aluminium by electrolysis.
(v) Explain why it is preferable to use a number of graphite electrodes as anode instead of a single electrode, during the above electrolysis.
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Q4
The following is an extract from 'Metals in the Service of Man, Alexander and Street/Pelican 1976':
'Alumina (Aluminium oxide) has a very high melting point of over 2000 C so that it cannot readily be liquefied. However, conversion of alumina to aluminium and oxygen, by electrolysis, can occur when it is dissolved in some other substance'.
(a) Which solution is used to react with bauxite as a first step in obtaining pure aluminium oxide?
(b) The aluminium oxide for the electrolytic extraction of aluminium is obtained by heating aluminium hydroxide. Write the balanced chemical equation for this reaction.
(c) Name the element which serves both as anode and the cathode in the extraction of aluminium.
(d) Write the balanced chemical equation for the reaction that occurs at the cathode during the extraction of aluminium by electrolysis.
(e) Give the balanced chemical equation for the reaction which occurs at the anode when aluminium is purified by electrolysis.
View Solution
Q5
Arrange to indicate the process of production of aluminium from bauxite.

Note: A - Aluminium B - Bauxite Q - Quarry R - Refinery
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