CBSE Class 10 Science Question Bank with Important Questions 2026: Master Chemical Reactions, Acids, Metals, and Carbon
- Feb 17
- 4 min read
As the 2026 board exams approach, the pressure to perform in Science is higher than ever. To secure a 95+ score, simply reading the textbook isn't enough; you need a strategic approach.
This comprehensive CBSE Class 10 Science Question Bank is designed to provide you with a laser-focused roadmap for the Chemistry section, covering everything from the latest competency-based patterns to high-weightage topics that frequently appear in previous years’ papers.
Understanding the 2026 CBSE Science Exam Pattern
Before diving into the questions, it is vital to understand what you are up against. For the 2025-26 academic session, the CBSE has increased the weightage of competency-based questions to 50%. This means rote memorization of definitions will no longer suffice. You must be able to apply concepts to real-life scenarios, especially in Chemistry.
The theory paper remains 80 marks, with Unit 1 (Chemical Substances - Nature and Behaviour) carrying a massive 25 marks. This unit includes the four pivotal chapters we will discuss today.
CBSE Class 10 Chapter 1: Chemical Reactions and Equations
This chapter is the foundation of Chemistry. In 2026, expect a heavy focus on balancing equations and identifying reaction types through observation-based questions.
Important Questions for 2026
Balancing & Implications: Why is it essential to balance a chemical equation? Provide an example of a skeletal equation and its balanced form.
Thermal Decomposition: Explain why the heating of Lead Nitrate is considered a decomposition reaction. Mention the color change and the gas evolved.
Redox Reactions: In the reaction of Copper Oxide with Hydrogen, identify the substance oxidized and the one reduced.
Practical Application: What happens when Zinc granules are added to dilute Sulphuric Acid? Describe the observations and the test for the gas evolved.
High-Frequency Formulas
Quick Lime (Calcium Oxide)
Slaked Lime (Calcium Hydroxide)
Limestone (Calcium Carbonate
Ferric Oxide
Lead Nitrate
Chapter 2: Acids, Bases, and Salts
This chapter bridges the gap between theory and everyday life. The CBSE Class 10 Science Question Bank frequently includes questions on pH scale applications and the manufacturing of industrial salts.
Top Priority Topics
The pH Scale: Why does the tooth enamel corrode when pH falls below 5.5? How do antacids work in the human stomach?
Chlor-Alkali Process: Describe the electrolysis of brine. What are the products formed at the anode and cathode?
Water of Crystallization: Explain the transition from Gypsum to Plaster of Paris. Why must POP be stored in moisture-proof containers?
Essential Salt Formulas to Remember
Bleaching Powder (Calcium Oxychloride)
Baking Soda (Sodium Hydrogen Carbonate)
Washing Soda (Sodium Carbonate Decahydrate)
Plaster of Paris (Calcium Sulphate Hemihydrate)
Gypsum (Calcium Sulphate Dihydrate)
Chapter 3: Metals and Non-Metals
Based on recent paper analysis, the 2026 exam will likely emphasize the Reactivity Series and Metallurgical Processes.
Must-Prepare Questions
Amphoteric Oxides: Define amphoteric oxides with two examples. Show their reaction with both acids and bases.
Ionic Compounds: Why do ionic compounds have high melting points? Illustrate the electron dot structure of Magnesium Chloride.
Extraction of Metals: Describe the roasting and calcination processes. Which method is used for sulphide ores?
Corrosion Prevention: What is galvanization? How does it protect iron from rusting even if the zinc coating is scratched?
Key Chemical Terms
Sodium Aluminate
Sodium Zincate
Cinnabar (Mercuric Sulphide)
Cuprite (Cuprous Oxide)
Chapter 4: Carbon and Its Compounds
Carbon is the "jack of all trades" in the 2026 syllabus. This chapter is purely conceptual and requires a deep understanding of bonding and functional groups.
Competency-Based Important Questions
Versatile Nature: Explain the concepts of Catenation and Tetravalency that allow carbon to form a vast number of compounds.
Homologous Series: Define a homologous series. What are the two consecutive members of the Alkyne series?
Saponification vs. Esterification: Distinguish between these two reactions. Why is esterification important in the perfume industry?
Soaps and Detergents: Explain the micelle formation mechanism. Why do soaps fail to lather in hard water?
Common Carbon Compounds
Ethanol (Ethyl Alcohol)
Ethanoic Acid (Acetic Acid)
Methane
Ethene
Sodium Ethoxide
2026 Board Exam Strategy: Tips from Toppers
Using a CBSE Class 10 Science Question Bank effectively requires more than just reading questions. Follow these three steps:
The 15-Minute Rule: Use the reading time to identify the Section D (5-mark) questions you are most confident in.
Diagram Precision: In Chemistry, always draw neat, labeled diagrams for experiments like the "Electrolysis of Water" or the "Action of Steam on Metals."
Keyword Focus: Examiners look for specific terms like "precipitate," "effervescence," "exothermic," and "displacement." Underline these in your answers.
Official Resources & Links
Download Official CBSE Question Bank: CBSE Academic Portal
Maharashtra Board (HSC/SSC) Support: MSBSHSE Official Site
Practical Exam Guidelines: CBSE Labs & Manuals
Conclusion
Success in the 2026 Science board exam is a result of consistent practice and conceptual clarity. By mastering the chapters in this CBSE Class 10 Science Question Bank, you are not just preparing for an exam but building a solid foundation for higher studies in medicine or engineering. Focus on the "why" behind every chemical reaction, and the marks will follow.
Frequently Asked Questions (FAQs)
Q1: Where can I find the official CBSE Class 10 Science Question Bank for 2026?
A: You can download the official practice material and competency-based questions directly from the CBSE Academic Website. It is the most reliable source for the updated 2026 exam pattern.
Q2: Which chapter in Chemistry has the highest weightage?
A: Historically, Chemical Reactions and Equations and Metals and Non-Metals carry significant weightage. However, the 25-mark Unit 1 is balanced across all four chapters, making each essential for a high score.
Q3: Are previous years' questions still relevant for the 2026 exam?
A: Yes! While the question style is shifting toward competency-based items, the core concepts remain the same. Solving at least the last 5 years of papers helps you identify repeated "High Order Thinking Skill" (HOTS) questions.
Q4: How should I prepare for the "Case-Study" questions in Science?
A: Focus on the "Did You Know" boxes and activities in your NCERT textbook. Most case studies are built around these practical experiments and real-world applications of chemical properties.
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