1. Tardigrade
  2. Question
  3. Chemistry
  4. 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. (iii) reduce Al 3+ into Al ( s ). (iv) acts as catalyst.

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Q. 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.
(iii) reduce $Al ^{3+}$ into $Al ( s )$.
(iv) acts as catalyst.

General Principles and Processes of Isolation of Elements

Solution:

Correct answer is (a) (i) and (ii)