Class 12 Chemistry Questions That Repeat Every Year | CBSE Important Repeated Questions
Table of Contents
Introduction
Many students think Chemistry is difficult, but CBSE board exams follow a predictable pattern.
Every year, similar questions are repeated with slight changes in wording.
If you prepare these most repeated Chemistry Class 12 questions, you can easily pass and score good marks in the CBSE 2026 exam.
High Weightage Chapters in Class 12 Chemistry
| Chapter Name | Importance Level |
|---|---|
| Electrochemistry | ⭐⭐⭐⭐⭐ |
| Chemical Kinetics | ⭐⭐⭐⭐ |
| D and F Block Elements | ⭐⭐⭐⭐⭐ |
| Coordination Compounds | ⭐⭐⭐⭐⭐ |
| Biomolecules | ⭐⭐⭐⭐ |
| Aldehydes, Ketones & Carboxylic Acids | ⭐⭐⭐⭐ |
| Amines | ⭐⭐⭐ |
| Haloalkanes & Haloarenes | ⭐⭐⭐ |
| Surface Chemistry | ⭐⭐ |
These chapters guarantee repeated questions every year.
Chapter-Wise Questions That Repeat Every Year
1. Electrochemistry (Most Important)
Repeated Questions
-
Explain electrochemical cell and electrode potential.
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Derive Nernst equation.
-
Calculate EMF of a cell.
-
Explain corrosion and its prevention methods.
2. Chemical Kinetics
Frequently Asked Questions
-
Define rate of reaction and rate constant.
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Explain order and molecularity of reaction.
-
Derive integrated rate law for first-order reaction.
3. D and F Block Elements
Most Expected Questions
-
Explain variable oxidation states of transition metals.
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What is lanthanide contraction? Write its effects.
-
Why are transition metals paramagnetic?
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Explain complex formation and catalytic properties.
4. Coordination Compounds
Repeated Questions
-
Define coordination number and ligands.
-
Explain Werner’s theory.
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Write types of isomerism in coordination compounds.
-
Explain nomenclature rules.
5. Biomolecules
Expected Questions
-
Define carbohydrates, proteins, nucleic acids.
-
Difference between DNA and RNA.
-
Structure of proteins and amino acids.
6. Aldehydes, Ketones and Carboxylic Acids
Repeated Questions
-
Write chemical reactions of aldehydes and ketones.
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Distinguish between aldehyde and ketone.
-
Explain carboxylic acids properties and reactions.
7. Amines
Frequently Asked
-
Classification of amines.
-
Hoffmann bromamide reaction.
-
Basicity of amines.
Top Repeated Theory vs Numerical Questions
| Question Type | Frequency in Board Exam |
|---|---|
| Theory Long Answer | Very High |
| Short Definitions | High |
| Numericals (Electrochemistry, Kinetics) | High |
| Case-Based Questions | Medium |
| Assertion-Reason | Medium |
Most Expected 5 Mark Long Questions
-
Derive Nernst equation.
-
Explain lanthanide contraction and its effects.
-
Write isomerism in coordination compounds.
-
Explain rate law and integrated rate law.
-
Describe biomolecules and their functions.
These questions repeat almost every year in some form.
Last Minute Revision Strategy for Chemistry
| Time Left | What to Study |
|---|---|
| 1 Day | Electrochemistry + Coordination Compounds |
| 6 Hours | D and F Block + Biomolecules |
| 2 Hours | Important definitions & reactions |
| 30 Minutes | Revise formulas and diagrams |
Tips to Pass Chemistry Class 12 Easily
-
Focus on high-weightage chapters first
-
Practice numericals daily
-
Learn important reactions and exceptions
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Use tables and diagrams in answers
-
Revise previous year questions
Smart study is more important than long study hours.
Conclusion
Preparing questions that repeat every year in Class 12 Chemistry is the smartest way to crack the CBSE board exam.
By focusing on Electrochemistry, D and F Block, Coordination Compounds, and Biomolecules, students can secure maximum marks with minimum effort.
With proper revision, practice, and smart preparation, Chemistry can become your highest scoring subject in CBSE 2026.
Click here to read about Class 12 D and F Block Important Questions 2026 | CBSE Chemistry High Weightage Topics: https://dekhocampus.com/news/class-12-d-and-f-block-important-questions-2026-cbse
FAQs (Frequently Asked Questions)
Electrochemistry, Coordination Compounds, and D and F Block Elements.
Yes, if you study repeated questions properly, you can easily pass and score good marks.
Yes, especially from Electrochemistry and Chemical Kinetics.
I’m Aditi Sharma, a passionate content writer currently pursuing my MA in English from Magadh University. With a strong command of language and a flair for storytelling, I specialize in crafting engaging articles, blogs, and creative content. My academic background enhances my ability to write well-researched, compelling, and grammatically refined pieces. I aim to create content that informs, inspires, and resonates with diverse audiences.
