A-LevelChemistryElectrochemistryOct/Nov 2013Paper 1 Q121 Mark
Strontium metal can be obtained by the electrolysis of molten strontium bromide, SrBr2, using the apparatus shown in the diagram. [Diagram of apparatus] Why is an atmosphere of argon used around the cathode?
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.
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The correct answer is D. This question tests the candidate's understanding of electrochemistry within the Chemistrysyllabus. The examiner's mark scheme requires...
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