Redox Reaction

Chemistry explores how matter transforms, and one key process is redox reactions, where oxidation (loss of electrons) and reduction (gain of electrons) occur together. These reactions are essential in metal extraction—like reducing iron ore—or in electroplating to coat items with metals like gold.They power batteries and fuel cells, converting chemical energy to electricity, and are used in industrial electrolysis to produce chlorine or aluminum.Redox processes also clean water, create bleach, and drive biological functions such as respiration and photosynthesis.Across industries—from pharmaceuticals to agriculture—they form the backbone of critical technologies.

This Story also Contains

1. Important topics of Redox Reaction
2. Overview of the Chapter
3. How To Prepare For Redox Reaction?
4. Important PYQs
5. Practice more questions from the link given below:
6. Prescribed Books
7. Conclusion:

Important topics of Redox Reaction

Overview of the Chapter

• This physical‑chemistry chapter teaches redox conceptually—no formulas to memorize. Learn to assign oxidation numbers, split reactions into half‑reactions, balance atoms, charges, and electrons, then combine them. Practice regularly to build confidence. It’s based on understanding, not memorization—perfect for clear, concept‑driven learning.

• Before reading this chapter, first, you must have the basic knowledge of Oxidation-reduction and associated concepts form Chapter: Some Basic Concept Of Chemistry

• Rest this complete chapter is very simple, just be regular and be consistent in your numerical practice.

Important PYQs

Question:

Which of the following oxidation reactions are carried out by both $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ and $\mathrm{KMnO}_4$ in acidic medium?
A. $\mathrm{I}^- \rightarrow \mathrm{I}_2$
B. $\mathrm{S}^{2-} \rightarrow \mathrm{~S}$
C. $\mathrm{Fe}^{2+} \rightarrow \mathrm{Fe}^{3+}$
D. ${I }^{-} \rightarrow \mathrm{IO}_3^{-}$
E. $\mathrm{S}_2 \mathrm{O}_3{ }^{2-} \rightarrow \mathrm{SO}_4{ }^{2-}$

Choose the correct answer from the options given below :

1) B, C and D only

2) A, D and E only

3) A, B and C only

4) C, D and E only

Solution:

$\begin{array}{ll}\mathrm{I}^{-} \xrightarrow{\mathrm{H}^{+}} \mathrm{I}_2 & \mathrm{I}^{-} \xrightarrow{\mathrm{OH}^{-}} \mathrm{IO}_3^{-} \\ \mathrm{S}^{-2} \xrightarrow{\mathrm{H}^{+}} \mathrm{S} & \mathrm{S}_2 \mathrm{O}_3^{2-} \xrightarrow{\mathrm{OH^-}} \mathrm{SO}_4^{2-} \\ \mathrm{Fe}^{+2} \longrightarrow \mathrm{Fe}^{+3} \\ \mathrm{~S}_2 \mathrm{O}_3^{2-} \xrightarrow{\mathrm{H}^{+}} \mathrm{S} \downarrow+\mathrm{SO}_4^{2-}\end{array}$

Oxidation reactions are carried out by both $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ and $\mathrm{KMnO}_4$ in acidic medium by: A, B and C

Hence, the correct answer is option (3).

Question:

Match the List-I with List-II

Choose the correct answer from the options given below :

1) A-II, B-III, C-IV, D-I

2) A-II, B-III, C-I, D-IV

3) A-III, B-IV, C-I, D-II

4) A-IV, B-I, C-II, D-III

Solution:

(A) Combustion of hydrocarbon
(B) Decomposition into gaseous product.
(C) Displacement of ' $V$ ' by ' Ca ' atom.
(D) Disproportionation of $\mathrm{H}_2 \mathrm{O}_2^{-1}$ into $\mathrm{O}^{-2}$ and $\mathrm{O}^{\circ}$ oxidation states.

Hence, the correct answer is option (1).

Practice more questions from the link given below:

Prescribed Books

First, you must finish the class XI and XII NCERT textbook and solve each and every example and unsolved question given in it. Then for advanced level preparation like JEE and NEET, you must follow O.P. Tandon. You must definitely solve the previous year's papers. Meanwhile, in the preparation, you must continuously give the mock tests for the depth of knowledge. Our platform will help you with a variety of questions for deeper knowledge with the help of videos, articles and mock tests.

Conclusion:

Redox reactions involve electron transfer—one substance loses electrons (oxidation), another gains (reduction). Mastering oxidation states and balancing half‑equations is vital for JEE MAINS and NEET electrochemistry questions, titrations, and cell problems . Applications span batteries, fuel cells, metal extraction, electroplating, corrosion prevention, respiration, photosynthesis, water purification, and chemical manufacture . Understanding these concepts builds strong foundations for competitive exams and real‑world chemistry.

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