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Important Questions for Class 10 Science Chapter 1 Chemical Reactions And Equations - PDF Download

JEE Mains & Advanced

Chemical Reactions and Equations for Class 10 Science Chapter 1 covers topics such as chemical reactions, types of chemical reactions and many more. These important questions help you in clearing your doubts so that you can score well in the board exam. While preparing for your exams, every student should practise these important questions of Class 10 Science to understand the concepts better. Practicing these important questions of Class 10 Science Chapter 1 will teach students time management skills and enhance their problem-solving skills. Also, you may come across a few of these questions in the board exam. Class 10 board examination is the most important exam in every students’ life. Students' future studies and career depend on the mark secured in the board exams. Every aspirant works hard to score well in Class 10 CBSE examinations. Science among all the 5 subjects of Class 10 has a vital role in every students’ career. You can secure better marks in the science subject if they want to become a doctor or an engineer in future. It is important that you should prepare and study hard for this subject, so you won't lose marks. Chapter 1 of Class 10 in Science subject, which is on chemical reactions and equations, is challenging for the students to understand. You should revise and practise the Important Questions of Class 10 Science Chapter 1 to secure good marks. These questions' main aim is to provide a better understanding of the chapter to the students. eSaral is a platform that provides free CBSE Solutions (NCERT) and other study materials for students. Math candidates who are looking for the better solutions, can download Class 10 Maths NCERT Solutions to help you to revise the complete syllabus and score more marks in your examinations.

Important Topics & Sub-topics of Chemical Reactions And Equations  Class 10 Science

Chemical Reactions:  

Definition: Understanding what chemical reactions are and how they differ from physical changes.

Chemical vs. Physical Changes: Differentiating between changes at the molecular level and changes in physical state.

Evidence of Chemical Reactions: Identifying indicators like color change, gas evolution, temperature change, and formation of a precipitate.

Chemical Equations:  

Writing and Balancing Equations: The process of representing chemical reactions using symbols and formulas, and ensuring the conservation of mass by balancing equations.

Coefficients and Subscripts: Exploring the significance of coefficients (numbers in front of formulas) and subscripts (numbers within formulas) in chemical equations.

Types of Reactions: Introduction to combination, decomposition, displacement, and double displacement reactions.

Balancing Chemical Equations: Understanding the Law of Conservation of Mass: Explaining how mass is conserved in a chemical reaction, emphasizing the importance of balancing equations.

Balancing Techniques: Step-by-step methods for balancing chemical equations, emphasizing the equal number of atoms on both sides.

Types of Chemical Reactions

Combination Reactions: Reactions where two or more substances combine to form a new substance.

Decomposition Reactions: Breaking down of a compound into simpler substances.

Displacement Reactions: Understanding single and double displacement reactions.

Redox Reactions: Introduction to oxidation and reduction reactions and their interdependence.

Effects of Chemical Reactions

Evolution of Gas: Identifying reactions that produce gases and understanding their properties.

Formation of a Precipitate: Recognizing reactions that lead to the formation of insoluble products.

   - Change in Color and Temperature: Exploring reactions that result in noticeable color changes or changes in temperature.

Chemical Equations and Chemical Formulas:

Chemical Formulas: Understanding the representation of elements and compounds using symbols and formulas.

Rules for Writing Formulas: Guidelines for writing correct chemical formulas.

Law of Conservation of Mass

Statement: Clearly stating the law and its implication in chemical reactions.

Importance: Emphasizing why the conservation of mass is a fundamental principle in chemistry.

Oxidation and Reduction

Redox Reactions: Identifying the transfer of electrons in chemical reactions.

Oxidation and Reduction: Definitions and recognizing them in reactions.

Corrosion and Rancidity

Corrosion: Understanding the process, its causes, and preventive measures.

Rancidity: Causes of rancidity in substances containing fats and oils, and methods to prevent it.

These detailed topics provide a comprehensive overview of the Class 10 Science curriculum on chemical reactions and equations.

Class 10 Science Chapter 1 Chemical Reactions And Equations Weightage

The weightage of topics within Chapter 1 (Chemical Reactions and Equations) of Class 10 Science can vary based on the specific curriculum or examination board. However, a general distribution of weightage might look like this:

Chemical Equations: Writing and balancing chemical equations: High weightage.

Types of Chemical Reactions: Combination reactions: Medium to high weightage.

Decomposition reactions: Medium to high weightage.

Displacement reactions: Medium to high weightage.

Double displacement reactions: Medium to high weightage.

Effect of Heat on Substances: Thermal decomposition: High weightage.

Combustion reactions: Medium to high weightage.

Redox Reactions: Basics of redox reactions: Low to medium weightage.

Chemical Equations and Stoichiometry:  

Stoichiometry and its application: Medium to high weightage.

Types of Chemical Reactions (Detailed):  

Oxidation and reduction reactions: Medium to high weightage.

Corrosion: Low to medium weightage.

Balancing Chemical Equations: Importance and methods: High weightage.

Chemical Reactions in Everyday Life:Examples of chemical reactions in daily life: Medium weightage.

Keep in mind that the weightage may vary, and it's essential to refer to the specific curriculum or examination pattern followed by your educational board for the most accurate information. Additionally, focus on mastering the fundamental concepts and understanding the principles behind chemical reactions and equations.

Benefits of Solving Class 10 Science  Chapter 1 Important Questions with Answers

  • The Chemical Reactions and Equations Class 10 chp 1 Important Questions are the most useful study material that you can refer to for securing better marks. These questions are prepared by experts at eSaral to provide the students with a proper explanation of the chapter.
  • Our subject expert team has done proper research before preparing these important questions, so the questions have a high probability of coming in the examinations.
  • The questions are provided with proper answers which will help you to understand the chapter and secure better grades.
  • By referring to these questions and answers, the students can have a good grip on chapter 1.
  • At the end, the important questions cover all the necessary topics and are prepared as per the latest guidelines of the CBSE board. It makes these questions a reliable and trustable source of information for students.


The Class 10 Science Chapter 1 Important Questions are simplified, and most suitably designed study material for class 10 students. These pyq cover each topic given under the chapter and will help make the learning process easier for the students. The questions are in an orderly manner and will make it easier for you to understand the chapter. Referring to these questions will give you a competitive edge in the examination and will help you secure better in your exams. By practising these questions, you can know the pattern of questions and the type of questions that might come in the examination. 

Frequently Asked Questions

Question 1: What are the important questions of Chapter 1 of Class 10 Science?

Answer: The following are the important questions of Chapter 1 of Class 10 Science-

  • What is the meaning of a word equation?

  • How to balance a chemical equation?

  • What are the steps to write a chemical equation?

  • What do you mean by a precipitation reaction?

  • What is a Physical Change?

  • Differentiate between single displacement and double displacement reactions.

  • What is the meaning of the redox reaction?

  • What is a Single Displacement reaction? Give an example.

  • Explain with an example, the meaning of exothermic reaction.

  • What is a Chemical Change?

  • What do you mean by a chemical reaction?

  • What is the meaning of the combination reaction?

  • Give an example of a Decomposition reaction.

  • Write in brief about the endothermic reaction.

  • What do you mean by double displacement reaction?

  • What is a Neutralisation reaction?

  • What are the different types of Chemical reactions?

Question 2:What is a chemical change?

Answer: A chemical change happens when one or more new compounds with differing physical and chemical characteristics are created. If two elements react with each other to form a new compound. The resultant compound has its own new properties which can be similar to the reactants or it may be completely different. In many cases, this sort of alteration is irreversible and permanent. When iron reacts with CuSO4 solutions, for example, ferrous sulphate and copper are produced as by-products.


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