In the electrolytic extraction of aluminum,mo | vedclass

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Question

(D) In the Hall-Heroult process for the extraction of aluminum,pure alumina $(Al_2O_3)$ has a very high melting point $(2323 \ K)$ and is a poor condu

Vedclass · Accepted Answer

Lower the melting point of alumina and increase its electrical conductivity

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(D) In the Hall-Heroult process for the extraction of aluminum,pure alumina $(Al_2O_3)$ has a very high melting point $(2323 \ K)$ and is a poor conductor of electricity. To overcome these issues,molten cryolite $(Na_3AlF_6)$ is added to the electrolyte. This serves two main purposes: $1$. It lowers the melting point of the mixture to about $1240 \ K$. $2$. It increases the electrical conductivity of the melt,facilitating the electrolytic process.

In the electrolytic extraction of aluminum,molten cryolite $(Na_3AlF_6)$ is used to:

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