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  • In the extraction of aluminium by Hall-Heroult process, purified {Al}_{2}{O}_{3} is mixed with {CaF}_{2} to (i) lower the melting point of {Al}_{2}{O}_{3} (ii) increase the conductivity of molten mixture.

In the extraction of aluminium by Hall-Heroult process, purified \text {Al}_{2}\text {O}_{3} is mixed with \text {CaF}_{2} to

(i) lower the melting point of \text {Al}_{2}\text {O}_{3}

(ii) increase the conductivity of molten mixture.

(iii) reduce \text {Al}^{3+} into Al(s).

(iv) acts as a catalyst

Answers (1)

The answer is the option (i, ii) Purified  \text {Al}_{2}\text {O}_{3} is mixed with \text {CaF}_{2} in Hall-Heroult process to lower the melting point of \text {Al}_{2}\text {O}_{3} and increase the conductivity of the molten mixture. Hence, option a and b are correct.

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