97. Determine whether each reaction is a redox reaction. For each
redox reaction, identify the oxidizing agent and the reducing
agent.
a. 4 Li(s) + O₂(g) → 2 Li₂O(s)
b. Mg(s) + Fe²+ (aq) → Mg²+ (aq) + Fe(s)
PbSO4(s) + 2 NaNO3(aq)
c. Pb(NO3)2(aq) + Na₂SO4(aq) →→→ PbSO4(s) +
d. HBr(aq) + KOH(aq) → H₂O(1) + KBr(aq)
