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Extraction of Aluminium

The chemical ...

Question

The chemical is added to reduce the melting point of the reaction mixture during the extraction of aluminium is:

A

Cryolite

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B

Calamine

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C

Kaolite

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D

Bauxite

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Solution

The correct option is A Cryolite
Answer: (a)

For reducing the melting point of Alumina during the extraction of aluminium by electrolytic process, Cryolite i.e. $N a_{3} A l F_{6}$ is added.

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Q. In the electrolytic extraction of aluminium, the substance added to reduce the melting point of alumina is .

Q.  Name the substance added for reducing the melting point of alumina during the extraction of aluminium.

In the electrolytic extraction of aluminium, the substances which are not used to reduce the melting point of alumina are:

During the electrolytic extraction of Aluminium, purified alumina is mixed with $N a_{3}$ $A l F_{6}$ and $C a F_{2}$ . Why?

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.

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