Which of the following is produced when water undergoes splitting during electrolysis?

• A. Hydrogen gas and oxygen gas
• B. Ozone and water vapor
• C. Nitrogen gas and oxygen gas
• D. Carbon dioxide and hydrogen gas

Answer: (A)

Verified step by step guidance

1. Understand the process of electrolysis of water: it involves passing an electric current through water to break it down into its elemental components.
2. Recall the chemical formula of water, which is \(\mathrm{H_2O}\), indicating it contains hydrogen and oxygen atoms.
3. During electrolysis, water molecules split into hydrogen ions (\(\mathrm{H^+}\)) and hydroxide ions (\(\mathrm{OH^-}\)), which then form gases at the electrodes.
4. At the cathode (negative electrode), hydrogen ions gain electrons to form hydrogen gas (\(\mathrm{H_2}\)), and at the anode (positive electrode), hydroxide ions lose electrons to form oxygen gas (\(\mathrm{O_2}\)).
5. Therefore, the products of water electrolysis are hydrogen gas and oxygen gas, matching the correct answer choice.