(A) Fused alumina $(Al_2O_3)$ is a bad conductor of electricity and has a very high melting point. Cryolite $(Na_3AlF_6)$ is added to purified alumina

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lower the melting point of alumina

(A) Fused alumina $(Al_2O_3)$ is a bad conductor of electricity and has a very high melting point. Cryolite $(Na_3AlF_6)$ is added to purified alumina to lower its melting point to about $1140 \ K$ and to increase its electrical conductivity.

Class 12 Chemistry General Principles and Processes of Isolation of Elements Reduction to free Metal

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In the electrolysis of alumina to obtain aluminium metal,cryolite is added mainly to

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A
lower the melting point of alumina
B
dissolve alumina in molten cryolite
C
remove the impurities of alumina
D
increase the electrical conductivity

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General Principles and Processes of Isolation of Elements

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Reduction to free Metal

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In the electrolysis of alumina to obtain aluminium metal,cryolite is added mainly to

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Aluminium is extracted from alumina $(Al_2O_3)$ by electrolysis of a molten mixture of

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