The chemical equation for a reaction between K2Cr2O7 and HCl is shown.
K2Cr2O7 + 14HCl → 2CrCl3 + 2KCl + 3Cl2 + 7H2O
Which of the following identifies the reactant that acts as an oxidizing agent in the reaction and explains the answer?
K2Cr2O7, because the oxidation number of K changes from +6 to +3.
K2Cr2O7, because the oxidation number of Cr changes from +6 to +3.
HCl, because the oxidation number of H changes from −1 to 0.
HCl, because the oxidation number of Cl changes from −1 to 0.
