For Redox reactions, oxidation and reduction both occur in a reaction:
Recall the mnemonics LEO GER.
Which equation represents an oxidation-reduction reaction
a. H2SO4 + 2 NH3 → (NH4)2SO4
b. H2SO4 + Na2CO3 → Na2SO4 + H2O + CO2
c. 2 K2CrO4 + H2SO4 → K2Cr2O7 + K2SO4 + H2O
d. 2 H2SO4 + Cu → CuSO4 + 2 H2O + SO2
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