The reaction (s) + (g) → (s) is not an oxidation-reduction reaction, as there are no changes in the oxidation states of the elements involved.
The chemical equation represents the formation of calcium carbonate from calcium oxide and carbon dioxide. Despite involving changes in the arrangement of atoms, this reaction is not classified as an oxidation-reduction (redox) reaction because there is no alteration in the oxidation states of the elements.
Oxidation-reduction reactions involve the transfer of electrons between elements, resulting in changes in their oxidation states. In this specific reaction, calcium oxide reacts with carbon dioxide to form calcium carbonate The oxidation states remain constant: calcium maintains an oxidation state of +2, oxygen retains -2, and carbon preserves +4.
The lack of change in oxidation states indicates that no electron transfer occurs, and as such, it does not meet the criteria for an oxidation-reduction reaction. Instead, this reaction is a synthesis reaction where two substances combine to form a new compound. Understanding the nature of chemical reactions and their classification helps elucidate the underlying principles governing chemical transformations.
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