The set of lettered choices below refers to multiple questions. Select the one lettered choice that best fits each statement or answers each question. A choice may be used once, more than once, or not at all in each set.
Electrolysis of water to form hydrogen and oxygen gases
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The chemical equation for this reaction is
Note that the oxidation number of hydrogen changes from to , and the oxidation number of oxygen changes from to . Hydrogen gains electrons and oxygen loses electrons. This is an oxidation-reduction reaction.