An aqueous solution of copper(II) sulfate is electrolysed, with copper used as the positive electrode and carbon used as the negative electrode. Which row gives the correct information for this electrolysis?
- Apositive electrode dissolves; copper deposited; electrolyte stays a constant blue colour
- Bpositive electrode dissolves; hydrogen gas given off; blue colour becomes more intense
- Chydrogen gas given off; oxygen gas given off; electrolyte stays a constant blue colour
- Doxygen gas given off; hydrogen gas given off; electrolyte stays a constant blue colour