Function of adding cryolite in the extraction of aluminium from pure alumina is

to increase the fusion temperature

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to decrease the conductivity of alumina

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to decrease the fusion temperature and increase the electrical conductivity

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none of these

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Solution

The correct option is C to decrease the fusion temperature and increase the electrical conductivity
As Alumina has high melting point and low conductivity, Cryolite is added to reduce melting point and flour spar is added in small amount to increase electrical conductivity.

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Similar questions

Q. Cryolite is added to alumina as to lower the fusion temperature and make the mass good conductor of electricity.

The role of fluorspar $(C a F_{2})$ which is added in small quantities in the electrolytic reduction of alumina dissolved in fused cryolite $(N a_{3} A l F_{6})$ is:

Q. Assertion: Electrical conductivity of semiconductors decreases with increasing temperature.
Reason: With increase in temperature, large number of electrons from the valence band can jump to the conduction band.

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. Name the following:
A compound added to lower the fusion temperature of electrolytic both in the extraction of aluminium.

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Function of adding cryolite in the extraction of aluminium from pure alumina is

The correct option is C to decrease the fusion temperature and increase the electrical conductivityAs Alumina has high melting point and low conductivity, Cryolite is added to reduce melting point and flour spar is added in small amount to increase electrical conductivity.

The correct option is C to decrease the fusion temperature and increase the electrical conductivity
As Alumina has high melting point and low conductivity, Cryolite is added to reduce melting point and flour spar is added in small amount to increase electrical conductivity.