Question

In the electrolysis of alumina, cryolite is added to

(a) lower the melting point of alumina 

(b) increase the electrical conductivity 

(c) minimise the anode effect 

(d) remove impurities from alumina

Answer 1

The correct option (a) lower the melting point of alumina 

(b) increase the electrical conductivity

Explanation:

In the electrolysis of alumina, cryolite is added. The function of cryolite are : 

(i) to lower the melting point of alumina and 

(ii) to increase the electrical conductivity.