A-LevelChemistryElectrochemistry9701/12 · Oct/Nov 2013 · 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?

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.

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Topic: Electrochemistry, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Oct/Nov 2013 Paper 1 Variant 2, question 12.

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