Chemistry 5070 · O Level · Electrolysis

Electrolysis — practice question

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

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