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The element that gains electrons/reduced is the oxidizing agent
Recall the mnemonic for redox reactions:
Loss Electrons → Oxidation → Reducing Agent
Gain Electrons → Reduction → Oxidizing Agent
Zn(s) → Zn2+(aq)
Consider the reaction:
Zn(s) + Fe2+(aq) → Zn2+(aq) + Fe(s)
Which is the oxidizing agent?