Multiple choice

What happens when electrodes are immersed in water and a current is passed?

  1. Bubbles of Sodium and Chlorine are produced

  2. Bubbles of Oxygen and Hydrogen are produced

  3. Bubbles of Copper and Sulphate are produced

  4. None of the above

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When water undergoes electrolysis, the electric current splits water molecules into hydrogen and oxygen gas. Hydrogen gas collects at the cathode, while oxygen gas collects at the anode.