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For each chemical reaction listed in the table below, decide whether the highlighted atom is being oxidized or reduced. a. 2 CrO4^2-(aq) + 2 H3O+(aq) → Cr2O7^2-(aq) + 3H2O(l) highlighted: Cr b. CuSO4(aq) + Zn(s) → ZnSO4(aq) + Cu(s) highlighted: Cu c. NH3(aq) + 2O2(g) → HNO3(aq) + H2O(l) highlighted: N d. H2S(aq) + 2NaOH(aq) → Na2S(aq) + 2H2O(l) highlighted: S