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Our expertly designed PDF worksheets cover everything from basic NCERT concepts to advanced numericals and competency-based questions based on the latest CBSE pattern.
This is part of our complete CBSE Class 10 Science Worksheet series covering all 13 chapters.
Free Worksheets for CBSE 10 Science Chapter 1: Chemical Reactions and Equations
Q1. A dilute ferrous sulphate solution was gradually added to a beaker containing an acidified permanganate solution. The light purple colour of the solution fades and finally disappears. Which of the following is the correct explanation for the given observation?
(a) $\mathrm{KMnO}_4$ is an oxidising agent, it oxidises $\mathrm{FeSO}_4$.
(b) $\mathrm{FeSO}_4$ acts as an oxidising agent and oxidises $\mathrm{KMnO}_4$.
(c) The colour disappears due to dilution; no reaction is involved.
(d) $\mathrm{KMnO}_4$ is an unstable compound and decomposes in the presence of $\mathrm{FeSO}_4$ to a colourless compound.
Ans. (a)
Q2. Identify ‘ $p$ ‘, ‘ $q$ ‘ and ‘ $r$ ‘ in the following balanced reaction:
$$
p \mathrm{~Pb}\left(\mathrm{NO}_3\right)_{2(s)} \xrightarrow{\text { Heat }} q \mathrm{PbO}_{(s)}+r \mathrm{NO}_{2(g)}+\mathrm{O}_{2(g)}
$$
(a) $2,2,4$
(b) $2,4,2$
(c) $2,4,4$
(d) $4,2,2$
Ans. (a)
Q3. A single displacement reaction is represented below:
$$
\mathrm{PQ}+\mathrm{R} \rightarrow \mathrm{PR}+\mathrm{Q}
$$
Which of the following is true about the reactants and products?
| Option | Type of ion of R in product | Stability of PR as compared to PQ |
|---|---|---|
| A | cation | more stable |
| B | cation | less stable |
| C | anion | more stable |
| D | anion | less stable |
Options:
(a) A
(b) B
(c) C
(d) D
Ans. (c)
Q4. Write balanced chemical equation for the reactions that occur when:
(A) steam is passed over red hot iron.
(B) natural gas is burnt in air.
(C) glucose reacts with oxygen in the cells of our body and provides energy.
Ans. (A) $3 \mathrm{Fe}+4 \mathrm{H}_2 \mathrm{O} \rightarrow \mathrm{Fe}_3 \mathrm{O}_4+4 \mathrm{H}_2$
(B) $\mathrm{CH}_4+2 \mathrm{O}_2 \rightarrow \mathrm{CO}_2+2 \mathrm{H}_2 \mathrm{O}$
(C) $\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6+6 \mathrm{O}_2 \rightarrow 6 \mathrm{CO}_2+6 \mathrm{H}_2 \mathrm{O}+$ Energy
Q5. What is the general name of chemicals that are added to fat and oil containing foods to prevent the development of rancidity?
Ans. The chemicals that are added to fat and oil containing food to prevent the development of rancidity are called antioxidants. These substances prevent the oxidation of fats and oils and thus, prevent bad odour from being formed in the food.
Q6. Complete the missing components/variables given as $X$ and $Y$ in the following:
(A) $\mathrm{Pb}\left(\mathrm{NO}_3\right)_{2(a q)}+2 \mathrm{KI}_{(a q)} \rightarrow \mathrm{PbI}_2(\mathrm{X})+2 \mathrm{KNO}_3(\mathrm{Y})$
(B) $\mathrm{Cu}_{(s)}+2 \mathrm{AgNO}_{3(a q)} \rightarrow \mathrm{Cu}\left(\mathrm{NO}_3\right)_{2(a q)}+\mathrm{X}_{(s)}$
(C) $\mathrm{Zn}_{(s)}+\mathrm{H}_2 \mathrm{SO}_{4(a q)} \rightarrow \mathrm{ZnSO}_4(\mathrm{X})+\mathrm{H}_2(\mathrm{Y})$
(D) $\mathrm{CaCO}_{3(\mathrm{~s})} \xrightarrow{\mathrm{X}} \mathrm{CaO}_{(\mathrm{s})}+\mathrm{CO}_{2(\mathrm{~g})}$
Ans. (A) $\mathrm{Pb}\left(\mathrm{NO}_3\right)_{2(a q)}+2 \mathrm{KI}_{(a q)} \rightarrow \mathrm{PbI}_{2(s)}+2 \mathrm{KNO}_{3(a q)}$
It is a precipitation reaction. When lead nitrate reacts with aqueous potassium iodide, it forms yellow precipitate of lead iodide $\left(\mathrm{Pbl}_2\right)$, while potassium nitrate $\left(\mathrm{KNO}_3\right)$ remains in the solution.
(B) $\mathrm{Cu}_{(s)}+2 \mathrm{AgNO}_{3(a q)} \rightarrow \mathrm{Cu}\left(\mathrm{NO}_3\right)_{2(a q)}+2 \mathrm{Ag}_{(s)}$
This is a displacement reaction. Since copper is more reactive than silver, it displaces silver from silver nitrate solution, resulting in the formation of solid silver and aqueous copper nitrate $\left(\mathrm{Cu}\left(\mathrm{NO}_3\right)_2\right)$.
(C) $\mathrm{Zn}_{(s)}+\mathrm{H}_2 \mathrm{SO}_{4(a q)} \rightarrow \mathrm{ZnSO}_{4(a q)}+\mathrm{H}_{2(g)}$
When zinc metal reacts with sulphuric acid, it displaces hydrogen gas from $\mathrm{H}_2 \mathrm{SO}_4$, producing hydrogen gas ( $\mathrm{H}_2$ ) and forming an aqueous zinc sulphate $\left(\mathrm{ZnSO}_4\right)$ solution.
(D) $\mathrm{CaCO}_{3(\mathrm{~s})} \xrightarrow{\text { Heat }} \mathrm{CaO}_{(\mathrm{s})}+\mathrm{CO}_{2(\mathrm{~g})}$
This is an example of thermal decomposition reaction. Calcium carbonate ( $\mathrm{CaCO}_3$ ) breaks down upon heating, producing calcium oxide (CaO), and releasing carbon dioxide gas.
Q7. Assertion (A): The colour of aqueous solution of copper sulphate turns colourless when a piece of lead is added to it.
Reason (R): Lead is more reactive than copper, and hence displaces copper from its salt solution.
(a) Both (A) and (R) are true, and (R) is the correct explanation of (A).
(b) Both (A) and (R) are true, and (R) is not the correct explanation of (A).
(c) (A) is true but (R) is false.
(d) (A) is false but (R) is true.
Ans. (a)
Q8. Assertion (A): The decomposition reaction of silver chloride into silver and chlorine is an exothermic process.
Reason (R): The reactions in which energy is absorbed are known as endothermic reactions.
(a) Both (A) and (R) are true, and (R) is the correct explanation of (A).
(b) Both (A) and (R) are true, and (R) is not the correct explanation of (A).
(c) (A) is true but (R) is false.
(d) (A) is false but (R) is true.
Ans. (d)
Q9. Study the figure given below and answer the following questions:
(A) Name the process depicted in the diagram.
(B) Write the composition of gases collected at anode and cathode.
(C) Write the balanced chemical equation of the reaction taking place in this case.
(D) The reaction does not take place if a few drops of dilute sulphuric acid are not added to water. Why?
Ans. (A) Electrolytic decomposition of water/ electrolysis of water.
(B) The gas collected at cathode is hydrogen, which is double the volume of oxygen collected at anode.
(C)
$$
2 \mathrm{H}_2 \mathrm{O}_{(l)} \xrightarrow[\text { current }]{\text { Electric }} 2 \mathrm{H}_{2(g)}+\mathrm{O}_{2(g)}
$$
(D) Pure water is a poor conductor of electricity due to the lack of free ions. Adding dilute sulphuric acid provides $\mathrm{H}^{+}$and $\mathrm{SO}_4{ }^{2-}$ ions, increasing water’s conductivity and allowing electrolysis to occur efficiently.
Q10. When firecrackers burn, they produce flames of various colours. This effect is achieved by mixing different metal powders during manufacturing. For instance, copper burns with a bright green colour, while magnesium burns with a bright white colour. A simple yet fascinating experiment involves burning magnesium, which can be conducted safely in a laboratory or even at home.
Based on the given information, answer the following questions.
(A) Identify the type of reaction that occurs when a strip of magnesium ribbon burns. Also, write a balanced chemical equation using appropriate symbols for the state of matter.
(B) When a strip of magnesium ribbon burns:
(i) What is the colour of the flame?
(ii) What is the colour of the ash formed?
(C) (i) How can you determine the nature of the ash formed?
(ii) Give an example of a combination reaction that occurs:
(1) between two elements.
(2) between two compounds.
(A) Burning of a strip of magnesium ribbon is a combination reaction. The balanced chemical equation for this reaction is:
$$
2 \mathrm{Mg}_{(s)}+\mathrm{O}_{2(g)} \rightarrow 2 \mathrm{MgO}_{(s)}
$$
(B) (i) The flame produced is dazzling white.
(ii) The ash formed is white in colour.
(C) (i) The ash formed on burning a strip of magnesium ribbon is magnesium oxide.
$$
2 \mathrm{Mg}_{(s)}+\mathrm{O}_{2(g)} \rightarrow 2 \mathrm{MgO}_{(s)}
$$
When dissolved in water, it forms magnesium hydroxide, which is basic in nature. This can be represented as:
$$
\mathrm{MgO}_{(s)}+\mathrm{H}_2 \mathrm{O}_{(l)} \rightarrow \mathrm{Mg}(\mathrm{OH})_{2(a q)}
$$
To confirm its basicity, a litmus test is performed. Blue litmus remains unchanged, while red litmus turns blue, indicating a basic solution.
(ii) (1) Combination reaction between two elements:
$$
2 \mathrm{H}_{2(g)}+\mathrm{O}_{2(g)} \rightarrow 2 \mathrm{H}_2 \mathrm{O}_{(l)}
$$
(2) Combination reaction between two compounds:
$$
\mathrm{NH}_{3(g)}+\mathrm{HCl}_{(g)} \rightarrow \mathrm{NH}_4 \mathrm{Cl}_{(s)}
$$
What is Included in the Chemical Reactions and Equations Class 10 Worksheet?
To ensure holistic preparation, our 10 Science Chemical Reactions and Equations worksheet is divided into sections that mimic the actual board exam paper. Inside the free PDF, you will find:
- Multiple Choice Questions (MCQs)
- Assertion-Reasoning questions.
- Case Study questions.
- Very Short, Short, and Long Answer type questions for deep conceptual clarity.
- Competency-Based Questions
Download 10 Science Chapter 1 Chemical Reactions and Equations Worksheets
Ready to test your knowledge? Click the button below to download the high-quality, printable PDF worksheet. We recommend solving these under a timed environment to simulate real exam conditions.
This worksheet is based on Chapter 1 – Chemical Reactions and Equations from the CBSE Class 10 Science NCERT textbook. It covers all major topics and includes a variety of question types to prepare students for both school exams and the CBSE Board exam.
The worksheet is available in two formats:
✅ Download PDF — clean, print-ready worksheet with complete answer key
✅ Teacher Editable Word File — fully editable .docx file to customise questions, add school name, institute name or modify as needed
Key Concepts to Revise Before Attempting the Worksheet
Before diving into the questions, make sure you have thoroughly read the NCERT textbook for Chapter 1. Pay special attention to:
- All core definitions, laws, and scientific principles mentioned in Chemical Reactions and Equations.
- Standard formulas and their SI units (especially for numerical-heavy chapters).
- Important diagrams, chemical equations, and graphs.
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Frequently Asked Questions (FAQs) on Chemical Reactions and Equations Worksheets
A1: Yes, absolutely. These worksheets are strictly designed according to the latest CBSE curriculum and NCERT guidelines for the current academic session. They cover all the updated topics and core concepts required for your board exams.
A2: Our worksheets provide a comprehensive mix of questions to ensure thorough preparation. This includes Multiple Choice Questions (MCQs), Assertion-Reasoning types, Competency-Based questions, and standard Short/Long answer questions, exactly as you will see in the actual board exams.
A3: Yes! Every worksheet comes with a detailed, step-by-step answer key. This allows students to self-evaluate their performance, understand the correct methodology, and learn how to structure their answers to score maximum marks.
A4: Definitely. Because they are structured to test both foundational knowledge and advanced problem-solving, they are perfect for both chapter-wise regular practice and quick, comprehensive revision right before your pre-boards or final board exams.
A5: Yes, we have integrated highly important and frequently asked questions from past CBSE board exams into these worksheets. Practicing these will give you a clear idea of the exam pattern and the difficulty level of the questions asked.
A6: Yes, the materials are formatted cleanly to be completely printer-friendly. You can easily download and print them so students can practice writing out their answers away from a screen.
