The correct answer is gain of oxygen
Concept:
Chemical Reactions:
- A process in which one or more compounds are formed as products completely different from the reacting substances is known as a chemical reaction.
- There is generally a change in heat, colour, or appearance when a chemical reaction takes place.
- The evolution of gas may also occur.
- A chemical reaction may be reversible or irreversible in nature.
Oxidation reaction:
- Oxidation Reaction refers to a reaction in which either the addition of Oxygen takes place or the removal of Hydrogen takes place.
- It can also be said as the process of loss of one or more electrons by atoms or ions.
- Example is:
Mg + O2 = Mg2O
Reduction Reaction:
- Reduction Reaction refers to a reaction in which either the addition of Hydrogen takes place or the removal of oxygen takes place.
- In the process of reduction, a chemical species also gains electrons.
- It is the reverse of the oxidation reaction.
- Example is:
H2 + F2 → HF
Explanation:
Oxidation is a chemical reaction that is characterized by
- loss of electron
- addition of oxygen atom
- removal of the hydrogen atom
The substance that undergoes oxidation is said to be oxidized.
The loss of electrons and an increase in the oxidation state are the characteristics of an oxidation reaction.
For example:
H2S + Cl2 → 2HCl + S
In this reaction, the chlorine is getting reduced to hydrochloric acid (HCl) on the addition of hydrogen provided by Hydrogen sulfide (H2S).

