Chemistry · May / June 2016 · Paper 11 · Question 15
5070Electrolysis
Aqueous copper(II) sulfate is electrolysed using carbon electrodes. Which observations will be made?
- Aat the positive electrode: colourless gas forms; electrolyte: blue colour fades; at the negative electrode: pink solid forms
- Bat the positive electrode: colourless gas forms; electrolyte: no change; at the negative electrode: colourless gas forms
- Cat the positive electrode: electrode decreases in mass; electrolyte: blue colour fades; at the negative electrode: colourless gas forms
- Dat the positive electrode: electrode decreases in mass; electrolyte: no change; at the negative electrode: pink solid forms
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Correct answer: A. at the positive electrode: colourless gas forms; electrolyte: blue colour fades; at the negative electrode: pink solid forms
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