Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
In the electrolysis of alumina, cryolite is added to (1) lower the melting point of alumina (2) increase the electrical conductivity (3) minimize the anode effect (4) remove impurities from aluminaA) 1, 2 and 3 are correct
B) 1 and 2 are correct
C) 2 and 4 are correct
D) 1 and 3 are correct
Correct Answer: B
Solution :
Cryolite lowers the melting point of alumina and increases its electrical conductivity. Due to these reasons, it is added with alumina during electrolysis.
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