The appropriate response is Reduction. It is a chemical reaction that includes the picking up of electrons. It alludes to the side that acknowledges electrons. At the point when iron responds with oxygen, it frames a concoction called rust. In that case, the iron is oxidized and the oxygen is lessened.
The decomposition of iron oxide to elemental can be represented by the following equation:
In iron oxide (Fe2O3), the oxidation state of iron is +3 while that of oxygen is -2. Therefore, the above reaction is a redox (reduction oxidation reaction).
Here, iron in iron oxide gains 3 electrons and gets reduced from Fe3+ to Fe(0). Whereas, the oxygen loses 2 electrons and gets reduced from O2- to O(0).