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.

Question

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. (A) (i) and (ii) (B) (i), (ii) and (iii) (C) (iii) and (iv) (D) (ii), (iii) and (iv)

Tardigrade Admin · Accepted Answer

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

Q. In the extraction of aluminium by Hall-Heroult process, purified Al2​O3​ is mixed with CaF2​ to (i) lower the melting point of Al2​O3​. (ii) increase the conductivity of molten mixture. (iii) reduce Al3+ into Al(s). (iv) acts as catalyst.

(i) and (ii)

(i), (ii) and (iii)

(iii) and (iv)

(ii), (iii) and (iv)

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

Q. In the extraction of aluminium by Hall-Heroult process, purified $A l_{2} O_{3}$ is mixed with $C a F_{2}$ to
(i) lower the melting point of $A l_{2} O_{3}$ .
(ii) increase the conductivity of molten mixture.
(iii) reduce $A l^{3 +}$ into $A l (s)$ .
(iv) acts as catalyst.