Question

7) Observe the following diagram and answer the questions
Anode
Graphite)
Graphic lining)
Steet tona
III
Mixture of alum
nolite and for par
Outlet for molten
Molten
aluminium
a) What is the purpose of mixing 'Cryolite' and 'Fluorspar' with 'alumina' in
the electrolytic readuction of alumina?
b) Write the 'anode reaction
c) Write the 'cathode reaction​

Answer 1

Explanation:

a)The purpose of mixing cryolite and fluorspar with alumina is to decrease the fusion temperature of alumina and to make it good conductor of electricity.

b)Anode reaction:

4Al³+ + 12e- = 4Al

c)Cathode reaction:

6O²- - 12e-. =3O2

C+02 = CO2

Answer 2

Answer:

a) It reduces the fusion temperature of aluminia to make it a good conductor of electricity.

b) The anode is where the oxidation takes place.

c) The cathode is where the reduction takes place.