For the following reaction, identify the atom oxidized, the atom reduced, the oxidizing agent, the reducing agent, the oxidation half-reaction, and the reduction half-reaction.
Mg + HCl MgCl2 + H2

Fe + V2O3 Fe2O3 + VO

KMnO4 + KNO2 + H2SO4 MnSO4 + H2O + KNO3 + K2SO4

K2Cr2O7 + SnCl2 + HCl CrCl3 + SnCl4 + KCl + H2O

KMnO4 + NaCl + H2SO4 Cl2 + K2SO4 + MnSO4 + H2O + Na2SO4

K2Cr2O7 + H2O + S SO2 + KOH + Cr2O3

KClO3 + C12H22O11 KCl + H2O + CO2

H2C2O4 + K2MnO4 CO2 + K2O + Mn2O3 + H2O

Mn(NO3)2 + NaBiO3 + HNO3 HMnO4 + Bi(NO3)3 + NaNO3 + H2O

H2C2O4 + KMnO4 CO2 + K2O + Mn2O3 + H2O