| (i) lower the melting point of \[A{{l}_{2}}{{O}_{3}}\]. |
| (ii) increase the conductivity of molten mixture. |
| (iii) reduce \[A{{l}^{3+}}\] into \[Al\left( s \right).\] |
| (iv) acts as catalyst. |
A) (i) and (ii)
B) (i), (ii) and (iii)
C) (iii) and (iv)
D) (ii), (iii) and (iv)
Correct Answer: A
Solution :
[a] In the extraction of aluminium by Hall- Heroult process purified \[A{{l}_{2}}{{O}_{3}}\] is mixed with \[Ca{{F}_{2}}\] to lower the melting point by \[A{{l}_{2}}{{O}_{3}}\] and increase the conductivity of molten mixture.
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