Final answer:
The given reaction under acidic conditions is an oxidation-reduction (redox) reaction, involving the transfer of electrons, where Fe2+ is oxidized and Cr2O72- is reduced.
Step-by-step explanation:
The reaction Cr2O72- + Fe2+ → Cr3+ + Fe3+ under acidic conditions is an example of an oxidation-reduction reaction. This type of reaction, also known as a redox reaction, involves the transfer of electrons between species, where one substance is oxidized (loses electrons) and another is reduced (gains electrons).
In this case, Fe2+ is oxidized to Fe3+ and Cr2O72- is reduced to Cr3+. The process involves balancing the reaction by adding electrons, protons (H+ ions in acidic solution), and water molecules to ensure both mass and charge balance.