If a reactant is oxidized, another reactant must be reduced (option D).
Redox reaction also known as oxidation-reduction reaction relates to any reaction in which oxidation and reduction occur simultaneously.
This means that in a redox reaction, electrons are lost and gained at the same time.
The substance that loses electrons in a redox reaction is called reducing agent while the substance that gains electrons in a redox reaction is called oxidizing agent.
Therefore, if a reactant is oxidized, another reactant must be reduced.
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