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Which of the following reactions is considered a formation reaction? a) H(g) + Br(l) → HBr(g) b) 4Fe(s) + 3O2 → 2Fe2O3(s) c) CaO(s) + CO2(g) → CaCO3(s) d) Mg(s) + 1/2O2(g) → MgO(s) e) All of these are formation reactions.