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CBSE Class 10 Science Chapter 2 Acids, Bases and Salts Worksheet with Answers

Q: What is the difficulty level and suggested time for this Acids, Bases and Salts worksheet?

This worksheet is of moderate difficulty, aligned with CBSE Class 10 board exam standards. The suggested completion time is 90 minutes. Attempting it under timed conditions simulates actual exam pressure and helps improve speed and accuracy for the board exams.

Q: How many marks does CBSE Class 10 Science Chapter 2 carry in the board exam?

Acids, Bases and Salts typically contributes 8-10 marks in the CBSE Class 10 Science board exam. Questions range from 1-mark MCQs to 5-mark long answers, making thorough practice essential for scoring well in this high-weightage chapter.

Q: Are the questions in this worksheet based on the latest NCERT syllabus?

Yes, every question in this worksheet is aligned with the latest NCERT Class 10 Science syllabus for 2025. It covers chemical properties of acids and bases, pH scale importance, and preparation and uses of salts exactly as prescribed in the curriculum.

Q: Why is the answer key important for self-study?

The answer key with detailed explanations allows you to self-assess, identify weak areas, and understand the correct reasoning. It helps you learn from mistakes, reinforces concepts, and builds confidence for attempting similar questions in the board exam independently.

Q: Can I use this worksheet for quick revision before exams?

Absolutely. This worksheet serves as an excellent quick revision tool. Attempting it a week before your board exam helps consolidate concepts, improves recall of chemical equations, and highlights any remaining doubts that need clarification before the final paper.

Q: What should I do if I score less than 70% on this worksheet?

Scoring below 70% indicates gaps in understanding. Revisit the NCERT Class 10 Science Chapter 2 text, make concise notes, and re-attempt the worksheet after a few days. Consider using CBSETUTOR.ai for 24×7 AI tutoring and instant doubt clearing at ₹999/month with a 3-day free trial.

Q: Does this worksheet include the latest case-study question pattern?

Yes, Section F contains a case-study question mirroring the latest CBSE pattern introduced in recent years. It tests your ability to apply theoretical knowledge to real-world scenarios, an essential skill for scoring in the board exam.

Q: How do I prepare for chemical equations in this chapter?

Write and balance all equations from NCERT textbook exercises at least three times. Focus on acid-metal, acid-base, and acid-carbonate reactions. This worksheet includes multiple equation-based questions to reinforce your practice and ensure accuracy during the exam.

Q: Can this worksheet be printed and used offline?

Yes, this worksheet is designed in a printable format. You can download, print, and solve it offline using pen and paper, which is ideal for exam-like practice. After completion, check your answers with the detailed answer key provided at the end.

Q: Which are the most scoring topics in Acids, Bases and Salts for CBSE board exams?

The most scoring topics are pH scale and its applications in daily life, uses of salts like baking soda and washing soda, neutralisation reactions, and chemical equations involving acids reacting with metals, bases, and carbonates. Mastering these ensures strong marks.

Chapter 2 Acids, Bases and Salts forms a crucial part of the CBSE Class 10 Science curriculum, contributing significantly to board exam scores. This printable worksheet offers structured practice across all question types—MCQs, fill-in-the-blanks, short and long answers, and a case study—exactly as they appear in CBSE papers. Completing this 90-minute worksheet will strengthen your grasp on pH scale applications, chemical properties, and salt preparation. Print it, time yourself, and use the detailed answer key for self-correction.

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Key takeaways

✓40+ graded questions covering chemical properties of acids and bases, pH scale, and salt preparation methods from NCERT Class 10 Science
✓Difficulty level: Moderate; suggested completion time: 90 minutes for comprehensive practice and revision
✓Includes 6 MCQs, 5 fill-in-the-blanks, 5 match-the-following, 5 short-answer questions, 3 long-answer questions, and 1 case-study question
✓Complete answer key with explanations provided for every question to enable self-assessment and error correction
✓Covers important CBSE board exam topics: indicator behaviour, neutralisation reactions, pH importance in daily life, and uses of common salts
✓Case-study question mirrors latest CBSE pattern, testing application skills and analytical thinking
✓Printable format allows offline practice; perfect for weekend revision and pre-exam preparation sessions

Quick Chapter Recap: Acids, Bases and Salts

Before attempting the worksheet, revise these core concepts from NCERT Class 10 Science Chapter 2. Acids turn blue litmus red, taste sour, and react with metals to liberate hydrogen gas. Bases turn red litmus blue, feel soapy, and neutralise acids. The pH scale ranges from 0 to 14, with 7 being neutral; values below 7 indicate acidity and above 7 indicate basicity. Important acids include hydrochloric acid (HCl), sulphuric acid (H₂SO₄), and nitric acid (HNO₃). Common bases are sodium hydroxide (NaOH), potassium hydroxide (KOH), and calcium hydroxide (Ca(OH)₂). Salts are formed by neutralisation reactions between acids and bases. The chapter also covers universal indicators, pH in daily life (soil pH, tooth decay, stomach acidity), and uses of salts like sodium chloride, sodium hydroxide, baking soda, washing soda, bleaching powder, and plaster of Paris. Chemical reactions include acid + metal → salt + hydrogen, acid + base → salt + water, and acid + carbonate → salt + water + carbon dioxide. Understanding these fundamentals ensures you can confidently tackle every question type in this worksheet and in your board exams.

Acids: turn blue litmus red, pH < 7, release H⁺ ions in solution
Bases: turn red litmus blue, pH > 7, release OH⁻ ions in solution
pH scale: 0 (strongly acidic) to 14 (strongly basic); neutral = 7
Neutralisation: acid + base → salt + water
Common salts and uses: NaCl (table salt), NaHCO₃ (baking soda), CaSO₄·½H₂O (plaster of Paris)

Section A: Multiple Choice Questions (MCQs)

This section contains 6 multiple-choice questions testing your conceptual understanding of acids, bases, and salts. Each MCQ carries 1 mark. These questions mirror the pattern seen in recent CBSE Class 10 board papers and cover indicators, pH values, chemical reactions, and practical applications. Read each question carefully, eliminate obviously wrong options, and select the most accurate answer. In the 2024 CBSE Class 10 Science paper, MCQs accounted for approximately 20% of the total marks, making this section essential for scoring well. Remember that CBSE often tests the reason behind a phenomenon rather than just factual recall. For instance, why does tooth decay start when pH falls below 5.5? Because acidic conditions weaken enamel. Such reasoning-based MCQs require thorough conceptual clarity. Attempt all 6 questions in about 10 minutes. Use the answer key at the end to verify your responses and understand the logic behind each correct option. If you score below 4 out of 6, revisit the NCERT text and your Class 10 Science notes before moving to the next section.

Q1. Which of the following is a strong acid? (a) Citric acid (b) Acetic acid (c) Sulphuric acid (d) Carbonic acid
Q2. The pH of a neutral solution is: (a) 0 (b) 7 (c) 14 (d) 10
Q3. When an acid reacts with a metal, which gas is evolved? (a) Oxygen (b) Nitrogen (c) Hydrogen (d) Carbon dioxide
Q4. Which indicator turns pink in basic solution? (a) Methyl orange (b) Litmus (c) Phenolphthalein (d) Turmeric
Q5. Sodium hydrogen carbonate is commonly known as: (a) Washing soda (b) Baking soda (c) Bleaching powder (d) Plaster of Paris
Q6. The chemical formula of plaster of Paris is: (a) CaSO₄·2H₂O (b) CaSO₄·½H₂O (c) CaCO₃ (d) Ca(OH)₂

Section B: Fill in the Blanks

Complete each statement with the appropriate term or formula. This section tests your recall of key definitions, chemical names, formulae, and properties discussed in NCERT Class 10 Science Chapter 2. Each blank carries 1 mark. Fill-in-the-blank questions require precise terminology; for example, writing 'common salt' instead of 'sodium chloride' may not fetch full marks if the question specifically asks for a chemical name. Pay attention to correct spelling of chemical terms like 'neutralisation' (Indian English spelling) and 'phenolphthalein'. These questions often appear in CBSE board exams as part of the 2-mark or 3-mark short-answer section, so mastering them ensures you do not lose easy marks. Attempt all 5 blanks in approximately 8 minutes. After completing, cross-check with the answer key provided at the end of this worksheet. If you find any errors, write the correct answer three times in your notebook to reinforce memory. This active recall technique significantly improves retention for board exams.

Q7. Acids release __________ ions in aqueous solution.
Q8. The process of mixing an acid with a base to form salt and water is called __________.
Q9. The pH of lemon juice is approximately __________, indicating it is acidic.
Q10. Calcium oxide reacts vigorously with water to form __________.
Q11. The salt used in making bread and cakes fluffy is __________.

Section C: Match the Following

Match the items in Column A with the most appropriate item in Column B. Each correct match earns 1 mark, for a total of 5 marks in this section. Matching questions assess your ability to connect concepts, chemical formulae, uses, and properties. For instance, linking 'bleaching powder' with its chemical formula 'CaOCl₂' or connecting 'pH 14' with 'strongly basic' requires both factual knowledge and conceptual understanding. CBSE Class 10 Science exams frequently include such questions to test comprehensive grasp rather than rote learning. When attempting match-the-following, first identify the pairs you are most confident about and mark them. Then use elimination to deduce the remaining pairs. Write your answers as A-i, B-ii, and so on in your answer sheet. Spend about 7 minutes on this section. After checking the answer key, if you made any mistakes, review the relevant sections in your NCERT Class 10 Science textbook to clarify the associations. This method ensures you do not repeat errors in your board exam.

Column A: (A) Sodium chloride, (B) Sodium hydroxide, (C) Plaster of Paris, (D) Bleaching powder, (E) Washing soda
Column B: (i) CaSO₄·½H₂O, (ii) NaCl, (iii) Na₂CO₃·10H₂O, (iv) CaOCl₂, (v) NaOH
Instructions: Write pairs such as A-ii, B-v, etc.

Section D: Short Answer Questions (2-3 Marks Each)

Answer the following questions in 30-40 words each. This section contains 5 short-answer questions worth 2-3 marks each, totalling 12 marks. CBSE Class 10 Science short-answer questions test your ability to explain concepts concisely, write balanced chemical equations, and apply theoretical knowledge to practical scenarios. Quality matters more than quantity; a well-structured 35-word answer with a correctly balanced equation scores full marks, whereas a 60-word vague response may fetch only partial credit. Use bullet points if it makes your answer clearer. Always underline or highlight chemical formulae and equations. For example, when asked to explain why acids are kept in glass containers, mention that acids react with metal containers to form salts and release hydrogen gas, which is hazardous. Include relevant equations where possible. Allocate about 20 minutes for this section. Refer to the detailed answer key after completion to compare your responses. If your answer missed a key point, note it down in a separate revision sheet for quick review before your board exam.

Q12. Write a balanced chemical equation for the reaction between hydrochloric acid and sodium hydroxide. (2 marks)
Q13. Explain why tooth decay starts when the pH of the mouth falls below 5.5. (2 marks)
Q14. How is washing soda prepared from sodium chloride? Write the chemical equation. (3 marks)
Q15. What happens when dilute sulphuric acid is poured on zinc granules? Write the chemical equation. (2 marks)
Q16. State two uses of bleaching powder. (2 marks)

Section E: Long Answer and HOTS Questions (5 Marks Each)

Answer the following questions in 70-80 words each. This section contains 3 long-answer or higher-order thinking skills (HOTS) questions, each carrying 5 marks, for a total of 15 marks. Long-answer questions in CBSE Class 10 Science board exams demand detailed explanations, multiple chemical equations, diagrams (if asked), and real-world applications. Structure your answer in clear paragraphs or numbered points. Start with a definition or introductory statement, followed by detailed explanation, relevant chemical equations, and conclude with a practical example or application if appropriate. For instance, if asked to explain the pH scale, begin by defining it, mention the range 0-14, explain what values indicate acidity/basicity/neutrality, describe universal indicators, and cite examples like lemon juice (pH ~2) and soap solution (pH ~10). CBSE marking schemes award marks for each valid point; hence, covering all aspects ensures maximum score. Allocate around 25 minutes for this section. After attempting, use the answer key to self-assess. If you scored below 12 out of 15, seek help from CBSETUTOR.ai, which offers 24×7 AI tutoring with photo-upload problem solving at a flat ₹999/month for Classes 6-12, with a 3-day free trial to get started.

Q17. Explain the pH scale in detail. How does pH affect our daily life? Give three examples. (5 marks)
Q18. Describe the preparation of sodium hydroxide (caustic soda) by the chlor-alkali process. Write the chemical equation and mention two uses. (5 marks)
Q19. HOTS: A student added a few drops of universal indicator to three solutions X, Y, and Z. Solution X turned red, Y turned green, and Z turned dark blue. Identify the nature of each solution and suggest one chemical compound for each. Justify your answer. (5 marks)

Section F: Case-Study Based Question (4 Marks)

Read the passage carefully and answer the questions that follow. Case-study questions have been a staple in CBSE Class 10 Science papers since 2021. They test your ability to apply chapter concepts to real-life situations, interpret data, and reason scientifically. Each case study is followed by 3-4 sub-questions worth 1 mark each. Read the passage at least twice before attempting the questions to ensure you understand the context. Underline keywords such as pH values, chemical names, or reaction types mentioned in the passage. Your answers should be based strictly on the information given, combined with your knowledge from NCERT Class 10 Science Chapter 2. Do not make assumptions beyond the passage. These questions are designed to assess analytical and interpretive skills rather than rote memory. Allocate about 10 minutes to read, analyse, and answer the case study. Afterwards, verify each sub-question answer against the answer key. If any answer is incorrect, revisit the relevant NCERT section to strengthen your conceptual foundation. Case-study questions can be scoring if approached methodically and calmly during the board exam.

Complete Answer Key with Explanations

Below is the complete answer key for all sections of the worksheet. Each answer is accompanied by a brief explanation to help you understand the reasoning and ensure conceptual clarity. Use this key for self-assessment. If you score below 70% overall, consider revising your NCERT Class 10 Science Chapter 2 notes thoroughly and practising additional worksheets. CBSETUTOR.ai offers unlimited practice worksheets, instant doubt resolution through photo upload, and 24×7 AI tutoring at just ₹999 per month for all subjects and classes 6-12, with a 3-day free trial available. Scoring well in this chapter is achievable with regular practice and timely doubt clearing. Mark your errors in red, write correct answers, and maintain an error log for revision one week before your board exam. This systematic approach has helped thousands of CBSE students improve their scores by 15-20% in Science. Remember, Chemistry chapters like Acids, Bases and Salts are scoring if fundamentals are clear and you practice writing balanced equations neatly. Now cross-check every answer carefully, note down topics you found difficult, and plan focused revision sessions for those areas.

Section A Answers: Q1-(c) Sulphuric acid is a strong mineral acid. Q2-(b) Neutral solution has pH 7. Q3-(c) Acid + Metal → Salt + Hydrogen gas. Q4-(c) Phenolphthalein turns pink in base. Q5-(b) Baking soda is NaHCO₃. Q6-(b) Plaster of Paris is CaSO₄·½H₂O.
Section B Answers: Q7-hydrogen (H⁺). Q8-neutralisation. Q9-2 (acidic range). Q10-calcium hydroxide [Ca(OH)₂]. Q11-baking soda (sodium hydrogen carbonate).
Section C Answers: A-ii (NaCl), B-v (NaOH), C-i (CaSO₄·½H₂O), D-iv (CaOCl₂), E-iii (Na₂CO₃·10H₂O).
Section D Answers: Q12-HCl + NaOH → NaCl + H₂O; neutralisation reaction. Q13-Mouth pH below 5.5 makes saliva acidic; acid attacks tooth enamel (calcium phosphate), causing decay. Q14-NaCl + H₂O + CO₂ + NH₃ → NH₄Cl + NaHCO₃; heat NaHCO₃ → Na₂CO₃ + H₂O + CO₂. Q15-Zn + H₂SO₄ → ZnSO₄ + H₂↑; hydrogen gas evolved. Q16-Bleaching powder: disinfects water, bleaches cotton and linen in textile industry.
Section E Answers: Q17-pH scale 0-14; <7 acidic, 7 neutral, >7 basic. Lemon pH~2, blood pH 7.4, soap pH~10. Affects tooth decay, soil fertility, digestion. Q18-Chlor-alkali: 2NaCl + 2H₂O → 2NaOH + Cl₂ + H₂. Uses: soap making, paper manufacturing. Q19-X (red) acidic: HCl; Y (green) neutral: NaCl solution; Z (dark blue) strongly basic: NaOH. Universal indicator colours indicate pH.
Case Study Answers: (i) Acid in pickle reacts with metal, forming salt and hydrogen, corroding lid. (ii) Acidic nature (pH 3.5 < 7). (iii) Acid + Metal → Salt + H₂. (iv) Glass is inert; does not react with acids, preventing contamination and corrosion.

Frequently asked questions

What is the difficulty level and suggested time for this Acids, Bases and Salts worksheet?+

This worksheet is of moderate difficulty, aligned with CBSE Class 10 board exam standards. The suggested completion time is 90 minutes. Attempting it under timed conditions simulates actual exam pressure and helps improve speed and accuracy for the board exams.

How many marks does CBSE Class 10 Science Chapter 2 carry in the board exam?+

Acids, Bases and Salts typically contributes 8-10 marks in the CBSE Class 10 Science board exam. Questions range from 1-mark MCQs to 5-mark long answers, making thorough practice essential for scoring well in this high-weightage chapter.

Are the questions in this worksheet based on the latest NCERT syllabus?+

Yes, every question in this worksheet is aligned with the latest NCERT Class 10 Science syllabus for 2025. It covers chemical properties of acids and bases, pH scale importance, and preparation and uses of salts exactly as prescribed in the curriculum.

Why is the answer key important for self-study?+

The answer key with detailed explanations allows you to self-assess, identify weak areas, and understand the correct reasoning. It helps you learn from mistakes, reinforces concepts, and builds confidence for attempting similar questions in the board exam independently.

Can I use this worksheet for quick revision before exams?+

Absolutely. This worksheet serves as an excellent quick revision tool. Attempting it a week before your board exam helps consolidate concepts, improves recall of chemical equations, and highlights any remaining doubts that need clarification before the final paper.

What should I do if I score less than 70% on this worksheet?+

Scoring below 70% indicates gaps in understanding. Revisit the NCERT Class 10 Science Chapter 2 text, make concise notes, and re-attempt the worksheet after a few days. Consider using CBSETUTOR.ai for 24×7 AI tutoring and instant doubt clearing at ₹999/month with a 3-day free trial.

Does this worksheet include the latest case-study question pattern?+

Yes, Section F contains a case-study question mirroring the latest CBSE pattern introduced in recent years. It tests your ability to apply theoretical knowledge to real-world scenarios, an essential skill for scoring in the board exam.

How do I prepare for chemical equations in this chapter?+

Write and balance all equations from NCERT textbook exercises at least three times. Focus on acid-metal, acid-base, and acid-carbonate reactions. This worksheet includes multiple equation-based questions to reinforce your practice and ensure accuracy during the exam.

Can this worksheet be printed and used offline?+

Yes, this worksheet is designed in a printable format. You can download, print, and solve it offline using pen and paper, which is ideal for exam-like practice. After completion, check your answers with the detailed answer key provided at the end.

Which are the most scoring topics in Acids, Bases and Salts for CBSE board exams?+

The most scoring topics are pH scale and its applications in daily life, uses of salts like baking soda and washing soda, neutralisation reactions, and chemical equations involving acids reacting with metals, bases, and carbonates. Mastering these ensures strong marks.

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