A Levels Chemistry

Strontium metal can be obtained by the electrolysis of molten strontium bromide, SrBr2, using the
apparatus shown in the diagram.
steel cathode
atmosphere of
graphite anode
argon
molten strontium
molten
strontium
bromide
heat
Why is an atmosphere of argon used around the cathode?
A The argon keeps the strontium molten.
B The argon stops the molten strontium rising too high in the tube.
C A thin film of a compound of strontium and argon forms on the surface protecting the freshly
formed metal.
D Without the argon strontium oxide would form in the air.


Electrolysis, Electrode Potentials & Cells | 2004 - O/N - 9701/1 | Q15