Question

What happens when electricity is passed through ordinary water?​

Answer 1

Answer:

When an electric current is passed through water, “Electrolysis of water” occurs, which is the decomposition of water (H2O) into hydrogen gas (H2) and oxygen (O2). ... Hydrogen gas forms at the cathode where the electrons enter the water and at the anode, oxygen is formed.

Answer 2

Answer:

When electricity is passed through ordinary water, it decomposes to give hydrogen and oxygen gas. When the two terminals of a battery are combined with negative and positive electrodes that are immersed in water then the water is dissociated into its oxygen and hydrogen components.

Oxygen is collected on a positive electrode and hydrogen is collected on a negative electrode.