During the electrolysis of water, which gas is formed at the anode?

During the electrolysis of water, the process involves the splitting of water molecules into their constituent elements, hydrogen and oxygen, using electricity. At the anode, which is the positively charged electrode, oxidation takes place. In the case of water electrolysis, water molecules lose electrons and form oxygen gas, along with hydrogen ions (H⁺).

This means that oxygen is released at the anode, and thus option B is the correct answer. In contrast, at the cathode, which is negatively charged, reduction occurs, leading to the formation of hydrogen gas from the hydrogen ions. Understanding the roles of the anode and cathode is crucial in determining which gases are produced during the electrolysis process.