O-LevelChemistryElectrolysis5070/11 · Oct/Nov 2016 · Q141 Mark
Aqueous copper(II) sulfate is electrolysed using copper as the positive electrode and carbon as the negative electrode. Which row gives correct information about this electrolysis?
Apositive electrode: electrode dissolves, negative electrode: copper deposited, electrolyte: stays a constant blue colour
Bpositive electrode: electrode dissolves, negative electrode: hydrogen gas given off, electrolyte: blue colour becomes more intense
Cpositive electrode: hydrogen gas given off, negative electrode: oxygen gas given off, electrolyte: stays a constant blue colour
Dpositive electrode: oxygen gas given off, negative electrode: hydrogen gas given off, electrolyte: stays a constant blue colour
✓ Correct answer
A: positive electrode: electrode dissolves, negative electrode: copper deposited, electrolyte: stays a constant blue colour
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