When alumina is subjected to electrolysis, the aluminium is obtained at the anode.

True

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False

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Solution

The correct option is B False
When alumina is subjected to electrolysis ${Al}^{3 +}$ , it undegoes reduction and gains three electrons to form Al.

${Al}^{3 +} + 3 e^{-} \to Al (s)$

The reduction takes place at the cathode. So, aluminium will be obtained at the cathode.

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Similar questions

(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.

Q. 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.

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.
(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.

Q. Alumina, on electrolysis in presence of cryolite gives at anode:

Complete the table related to the electrolysis of Alumina:

Anode
Cathode
Equation of chemical reaction at anode
Equation of chemical reaction at cathode

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When alumina is subjected to electrolysis, the aluminium is obtained at the anode.

The correct option is B FalseWhen alumina is subjected to electrolysis Al3+, it undegoes reduction and gains three electrons to form Al. Al3++3e−→Al(s) The reduction takes place at the cathode. So, aluminium will be obtained at the cathode.

The correct option is B False
When alumina is subjected to electrolysis ${Al}^{3 +}$ , it undegoes reduction and gains three electrons to form Al.

${Al}^{3 +} + 3 e^{-} \to Al (s)$

The reduction takes place at the cathode. So, aluminium will be obtained at the cathode.