Concept:Oxidation is a chemical process that involves the gain of oxygen or the loss of hydrogen.
Explanation:Rusting of iron is an oxidation reaction.
Iron reacts with oxygen and water to form rust (iron oxide).
The equation is:
4Fe+3O2​+2H2​O→2Fe2​O3​⋅H2​O.
Opening of a soda bottle is not an oxidation reaction.
When the bottle is opened, dissolved carbon dioxide gas is released due to a drop in pressure.
No oxidation or reduction of any substance occurs.
Rancidity is an oxidation reaction.
Fats and oils react with oxygen from air to form peroxides, which then break down into compounds with unpleasant odour and taste.
Combustion is an oxidation reaction.
A fuel rapidly reacts with oxygen to produce heat and light (e.g., burning wood, coal, gasoline).
Thus, only opening of a soda bottle does not involve oxidation.
Answer:Opening of soda bottle