The major 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 :

as a catalyst

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to make the fused mixture very conducting

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to increase the temperature of the melt

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to decrease the rate of oxidation of carbon at the anode

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Solution

The correct option is B to make the fused mixture very conducting
The electrolysis of pure alumina faces some difficulties. Pure alumina is a bad conductor of electricity.

The fusion temperature of pure alumina is about $2000^{o} C$ and at this temperature when electrolysis is carried out on the fused mass, the metal formed vaporizes, as the boiling point of aluminium is $1800^{o} C$ .

These difficulties are overcome by using a mixture containing alumina, cryolite $(N a_{3} A l F_{6})$ , and fluorspar $(C a F_{2})$ .

Thus the conductivity is increased and the fusion temperature is lowered.

Answer is option B.

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Similar questions

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I. to act as a catalyst
II. to make the fused mixture very conduction
III. to lower the temperature of melting
IV. to decrease the rate of oxidation of carbon at the anode

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The major role of fluorspar (CaF2) which is added in small quantities in the electrolytic reduction of alumina dissolved in fused cryolite (Na3AlF6) is :

The major 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 :