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?

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

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.  

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