Chemistry · Oct / Nov 2020 · Paper 11 · Question 18
5070Electrolysis
Aqueous copper(II) sulfate is electrolysed using copper electrodes. The current is constant and the anode is weighed at regular time intervals. Which graph is obtained when the mass of the anode is plotted against time?
- AGraph A: mass of anode decreases rapidly then levels off
- BGraph B: mass of anode increases linearly from a non-zero value
- CGraph C: mass of anode decreases linearly from a non-zero value
- DGraph D: mass of anode increases linearly from zero
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Correct answer: C. Graph C: mass of anode decreases linearly from a non-zero value
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