All questions of Oxidation & Reduction for UPSC CSE Exam

Understanding Redox Reactions
Redox reactions, short for reduction-oxidation reactions, involve the transfer of electrons between two substances. These reactions are fundamental in various chemical processes, including metabolism and energy production.
Oxidizing Agent
- In a redox reaction, the substance that gains electrons is referred to as the oxidizing agent.
- When it gains electrons, it is reduced, meaning its oxidation state decreases.
- The oxidizing agent facilitates the oxidation of another substance by accepting electrons from it.
Role of the Oxidizing Agent
- The oxidizing agent is essential because it drives the reaction forward by accepting electrons from the reducing agent.
- Common oxidizing agents include substances like oxygen, chlorine, and potassium permanganate.
Reducing Agent
- The substance that loses electrons in the reaction is called the reducing agent.
- It is oxidized during the reaction, meaning its oxidation state increases as it donates electrons to the oxidizing agent.
Key Takeaway
- In summary, the correct answer is option A: Oxidizing agent. This is because the oxidizing agent is responsible for gaining electrons and enabling the reduction of another substance.
Understanding these roles in redox reactions is crucial for grasping fundamental concepts in chemistry, particularly in fields such as electrochemistry and organic reactions.