In the electrolytic reduction of alumina,why | vedclass

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(B) In the Hall-Heroult process,pure alumina $(Al_2O_3)$ has a very high melting point (about $2323 \ K$) and is a poor conductor of electricity. Cryo

Vedclass · Accepted Answer

To lower the melting point of alumina

Vedclass · Answer

(B) In the Hall-Heroult process,pure alumina $(Al_2O_3)$ has a very high melting point (about $2323 \ K$) and is a poor conductor of electricity. Cryolite $(Na_3AlF_6)$ is added to the electrolytic mixture for two main reasons: $1$. It lowers the melting point of the mixture to about $1140 \ K$. $2$. It increases the electrical conductivity of the molten mass. Among the given options,the most fundamental purpose for which cryolite is added is to lower the melting point of alumina to make the process energy-efficient and feasible.

In the electrolytic reduction of alumina,why is cryolite $(Na_3AlF_6)$ primarily added?

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