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

Cryolite

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$C a F_{2}$

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$N a_{3} A l F_{6}$

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graphite

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Solution

The correct options are
A
Cryolite

C
$N a_{3} A l F_{6}$

In the electrolytic extraction of aluminium, cryolite is used for the reduction of melting point and fluorspar is used for increasing the conductivity of the solution.

Inert graphite is the electrode used in the electrometallurgical (reduction) process. Aluminium is extracted from alumina by electricity which is the strongest reducing agent.

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Similar questions

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

Which of the following are added to concentrated alumina during the electrolytic reduction of alumina to aluminium by Hall-Heroult process?

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