Question

Which response contains all of the following I) PCl3 + 3 H2O → 3 HCl + H3PO3 II) Fe2O3 + 3 CO → 2 Fe + 3 CO2 III) CaCO3 + 2 HNO3 → Ca(NO3)2 + CO2 + H2O that are oxidation-reduction reactions and no others?

Answer 1

II) This is because Fe₂O₃ is reduced to Fe and CO is oxidized to CO₂

Step-by-step explanation:

The equation II which is Fe₂O₃ + 3CO → 2Fe + 3CO₂ is the only exclusive oxidation-reduction reaction since, Fe₂O₃ is reduced to Fe by the removal of oxygen and CO is oxidized to CO₂ by the addition of oxygen.

Equation I is a hydrolysis reaction while equation III is an acid-base reaction. There is change of oxidation number in equations I and III, but they are not exclusively oxidation-reduction reactions.