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Extraction of Aluminium

Complete the ...

Question

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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Solution

Anode Carbon rod
Cathode Carbon lining
Equation of chemical
reaction at anode $2 O^{- 2} \to O_{2} + 4 e^{- 1}$
Equation of chemical
reaction at cathode $A l^{+ 3} + 3 e^{- 1} \to A l$

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Q. Complete the table for electrolysis of copper.

Anode
Cathode
Electrolyte
Equation of the chemical reaction taking place at cathode
Equation of the chemical reaction taking place at cathode

Q. (a) Illustrate the arrangement of refining copper and label the anode, cathode and electrolyte.
(b) Write the chemical equation at the anode and cathode and sustain it as redox reaction.

Q. Assertion: Starting from aq. copper [II] sulphate solution, equations for the reactions at the cathode and anode during electrolysis of aq.

C u S O_{4}

using active copper electrodes is;
at anode:

C u^{+ 2} + 2 e^{-} \to C u

C u \to C u^{+ 2} + 2 e^{-}

Reason: Oxidation always take place at anode and reduction at cathode.

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. The electrolytic cell for alumina is given above.
Write the chemical equation of the reaction at the cathode.

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