Multiple choice

If an electric current is passed through acidified water by using carbon electrodes, then a chemical reaction takes place to form ________________ and oxygen.

  1. methane

  2. hydrogen

  3. nitrogen

  4. helium

  5. carbon dioxide

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

This is the correct option. If an electric current is passed through acidified water by using carbon electrodes, then a chemical reaction takes place to form hydrogen and oxygen.