Redox Reactions is Chapter 7 of the Class 11 NCERT Chemistry textbook and it introduces one of the most basic and important concepts in chemistry. The term ‘Redox’ stands for reduction and oxidation, which are processes that occur together in every chemical reaction involving electron transfer. This chapter explains oxidation numbers, rules for assigning them, balancing redox reactions using various methods, and their real-life applications. From rusting of iron to how our body produces energy from food, redox reactions are involved everywhere.
I am writing about this topic because many students find redox reactions tricky, especially while balancing equations and identifying oxidation states. But once you understand the logic behind electron transfer and how to assign oxidation numbers properly, it becomes easier. This chapter builds the foundation for electrochemistry in Class 12, and it’s often asked in entrance exams like JEE and NEET. Personally, I used to struggle with the ion-electron method until I started solving small redox reactions from daily life. This article will help you go through the key topics and also provide a link to download the official NCERT PDF of this chapter so you can revise it any time.
Key Topics in Redox Reactions
This chapter deals with the concept of electron gain and loss and how to identify these changes in chemical reactions. Here are the important topics:
1. Oxidation and Reduction
- Oxidation: Loss of electrons or gain of oxygen
- Reduction: Gain of electrons or loss of oxygen
- Occur together in a redox process
2. Redox Reactions
- Reactions involving both oxidation and reduction
- Real-life examples like corrosion, photosynthesis, combustion
3. Oxidising and Reducing Agents
- Oxidising agent: Gains electrons and gets reduced
- Reducing agent: Loses electrons and gets oxidised
4. Oxidation Number
- Rules for assigning oxidation numbers
- Identifying changes in oxidation states to spot redox processes
5. Types of Redox Reactions
- Combination reactions
- Decomposition reactions
- Displacement and disproportionation reactions
6. Balancing Redox Reactions
- Oxidation number method
- Ion-electron method (Half-reaction method)
- Practice with acidic and basic media
7. Redox Reactions in Everyday Life
- Examples from biology, environmental chemistry, industry
- Batteries, respiration, bleaching, and more
Download PDF
Click Here to Download NCERT Class 11 Chemistry Chapter 7: Redox Reactions PDF
