A-LevelChemistryGroup 29701/12 · Oct/Nov 2010 · Q171 Mark
Strontium metal can be obtained by the electrolysis of molten strontium bromide, SrBr₂, using the apparatus shown in the diagram. [Figure showing electrolysis apparatus for molten strontium bromide] Why is an atmosphere of argon used around the cathode?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Athin film of a compound of strontium and argon forms on the surface protecting the freshly formed metal.
BThe argon keeps the strontium molten.
CThe argon stops the molten strontium rising too high in the tube.
DWithout the argon, strontium oxide would form in the air.
✓ Correct answer
D: Without the argon, strontium oxide would form in the air.
Practise more questions on this topic
Oracle Prep sorts past-paper questions by topic, so you can drill Group 2 and see which topics are most likely to come up next.
Sign up free →