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

Question

In the electrolysis of alumina to obtain aluminium metal, cryolite is added mainly to (A) lower the melting point of alumina (B) dissolve alumina in molten cryolite (C) remove the impurities of alumina (D) increase the electrical conductivity

Tardigrade Admin · Accepted Answer

Fused alumina (Al2O3) is a bad conductor of electridty. Therefore, cryolite (Na3AlF6) and fluorspar (CaF2) are added to piuified alumina which not only make alumina a good conductor of electricity but also reduce the melting point of the mixture to around 1140 K.

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

lower the melting point of alumina

dissolve alumina in molten cryolite

remove the impurities of alumina

increase the electrical conductivity

Fused alumina $(A l_{2} O_{3})$ is a bad conductor of electridty. Therefore, cryolite $(N a_{3} A l F_{6})$ and fluorspar $(C a F_{2})$ are added to piuified alumina which not only make alumina a good conductor of electricity but also reduce the melting point of the mixture to around 1140 K.

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

lower the melting point of alumina

dissolve alumina in molten cryolite

remove the impurities of alumina

increase the electrical conductivity

Fused alumina (Al2​O3​) is a bad conductor of electridty. Therefore, cryolite (Na3​AlF6​) and fluorspar (CaF2​) are added to piuified alumina which not only make alumina a good conductor of electricity but also reduce the melting point of the mixture to around 1140 K.

Fused alumina $(A l_{2} O_{3})$ is a bad conductor of electridty. Therefore, cryolite $(N a_{3} A l F_{6})$ and fluorspar $(C a F_{2})$ are added to piuified alumina which not only make alumina a good conductor of electricity but also reduce the melting point of the mixture to around 1140 K.