Recall the mnemonic for redox reactions:
Loss Electrons → Oxidation → Reducing Agent
Gain Electrons → Reduction → Oxidizing Agent
This means the element that gains electrons/reduced is the oxidizing agent while the element that loses electrons/oxidized is the reducing agent.
Which of the following reactions are redox reactions?
a. 4 Li(s) + O2(g) → 2 Li2O(s)
b. Mg(s) + Fe2+(aq) → Mg2+(aq) + Fe(s)
c. Pb(NO3)2(aq) + Na2SO4(aq) → PbSO4(s) + 2 NaNO3(aq)
d. HBr(aq) + KOH(aq) → H2O(l) + KBr(aq)
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