Purification And Characterisation Of Organic Compounds Question 189
Question: In the extraction of aluminium by Hall-Heroult process, purified $ Al_2O_3 $ is mixed with $ CaF_2 $ to
(i) lower the melting point of $ Al_2O_3 $ . (ii) increase the conductivity of molten mixture. (iii) reduce $ A{{l}^{3+}} $ into $ Al( s ). $ (iv) acts as catalyst.
Options:
A) (i) and (ii)
B) (i), (ii) and (iii)
C) (iii) and (iv)
D) (ii), (iii) and (iv)
Show Answer
Answer:
Correct Answer: A
Solution:
[a] In the extraction of aluminium by Hall- Heroult process purified $ Al_2O_3 $ is mixed with $ CaF_2 $ to lower the melting point by $ Al_2O_3 $ and increase the conductivity of molten mixture.
BETA
