How does the electrolysis of water produce hydrogen gas? hydrogen cations give electrons to the anode through reduction reactions. hydrogen cations give electrons to the anode through oxidation reactions. electrons from the cathode combine with hydrogen cations through reduction reactions. electrons from the cathode combine with hydrogen cations through oxidation reactions.

Electrons from the cathode combine with hydrogen cations through reduction reactions.

Explanation:

Decomposition of water is breaking down of water into its constituents that are hydrogen and oxygen by the action electrical current.  

At anode:

At cathode:

Hydrogen cation from anode moves towards the negatively charged electrode that is towards the cathode. On reaching cathode hydrogen cation accepts electrons and get reduced to hydrogen gas through reduction reaction.

Hence, the correct option third option:

Electrons from the cathode combine with hydrogen cations through reduction reactions.

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