Last Updated on May 7, 2025 by XAM CONTENT
Hello students, we are providing case study questions for class 7 Science. Case study questions are the new question format that is introduced in CBSE board. The resources for case study questions are very less. So, to help students we have created chapterwise case study questions for class 7 Science. In this article, you will find case study questions for cbse class 7 Science chapter 2 Exploring Substances: Acidic, Basic, and Neutral.
| Chapter | Exploring Substances: Acidic, Basic, and Neutral |
| Book | Curiosity: Textbook of Science for Grade 7 |
| Type of Questions | Case Study Questions |
| Nature of Questions | Competency Based Questions |
| Board | CBSE |
| Class | 7 |
| Subject | Science |
| Useful for | Class 7 Studying Students |
| Answers provided | Yes |
| Difficulty level | Mentioned |
| Important Link | Class 7 Science Chapterwise Case Study |
Case Study Questions on Exploring Substances: Acidic, Basic, and Neutral
Case Study Question 1
Passage: A Science Fair Surprise
During a science fair, Ashwin and Keerthi received white sheets of paper at the entrance. A volunteer sprayed a liquid on them, and the words “Welcome to the Wonderful World of Science” appeared. Fascinated, the children visited a stall that demonstrated the use of litmus paper to test the acidic or basic nature of substances. They tested lemon juice, soap solution, salt water, and baking soda solution using both blue and red litmus papers and grouped them based on the changes observed.
Q1. What change will occur when blue litmus paper is dipped in lemon juice?
Answer: It turns red
Difficulty Level: Easy
Explanation: Lemon juice is acidic and acids turn blue litmus paper red.
Q2. Which of the following substances will turn red litmus paper blue?
(a) Vinegar
(b) Soap solution
(c) Sugar solution
(d) Tamarind water
Answer: (b)
Difficulty Level: Moderate
Explanation: Soap solution is basic in nature and bases turn red litmus paper blue.
Q3. If a substance does not change the colour of either blue or red litmus paper, it is most likely:
(a) Acidic
(b) Basic
(c) Neutral
(d) Synthetic
Answer: (c)
Difficulty Level: Easy
Explanation: Neutral substances like salt or sugar solution do not affect litmus paper colour.
Q4. In the litmus paper activity, which group would baking soda solution fall under?
(a) Group A – turns blue litmus red
(b) Group B – turns red litmus blue
(c) Group C – no change
(d) None of these
Answer: (b)
Difficulty Level: Moderate
Explanation: Baking soda is a mild base and turns red litmus blue, placing it in Group B.
Case Study Question 2
Passage: Nature’s Indicators
In another experiment, students were introduced to natural indicators like red rose extract and turmeric paste. They noticed that red rose extract turned red in acidic solutions and green in basic ones. Turmeric paper turned reddish-brown in bases but showed no change in acids or neutral substances. They also learned about hydrangea flowers that change colour depending on soil nature, and discussed the use of such indicators in daily life.
Q1. What colour change is expected when red rose extract is added to lemon juice?
(a) Green
(b) Red
(c) Purple
(d) No change
Answer: (b)
Difficulty Level: Easy
Explanation: Lemon juice is acidic and red rose extract turns red in acids.
Q2. Which natural indicator turns reddish-brown when mixed with a basic solution like soap water?
(a) Red rose extract
(b) Turmeric paper
(c) Litmus solution
(d) Beetroot juice
Answer: (b)
Difficulty Level: Moderate
Explanation: Turmeric turns reddish-brown in basic substances.
Q3. A hydrangea plant grown in acidic soil shows what colour of flowers?
(a) Red
(b) Pink
(c) Blue
(d) Yellow
Answer: (c)
Difficulty Level: Tough
Explanation: Acidic soil causes hydrangea flowers to appear blue; basic soil results in red/pink flowers.
Q4. What property makes red rose extract and turmeric useful as indicators?
(a) They are colourful
(b) They are natural and change colour with pH
(c) They dissolve easily in water
(d) They are fragrant
Answer: (b)
Difficulty Level: Moderate
Explanation: Their ability to change colour based on acidic or basic nature makes them useful as indicators.
We hope the given case study questions for Exploring Substances: Acidic, Basic, and Neutral Class 7 helps you in your learning.
🎮 Bonus Challenge: Can You Solve This Scientific Mystery?
🧪 Solve the Mystery: The Case of the Disappearing Message
During the science fair, Keerthi received a white paper. When a liquid was sprayed on it, the words “Welcome to the Wonderful World of Science” magically appeared!
Can you solve the clues and uncover the science behind this amazing event?
Also check
- Curiosity Class 7 Science Chapter 12 Earth, Moon, and the Sun Case Study Questions
- Curiosity Class 7 Science Chapter 11 Light: Shadows and Reflections Case Study Questions
- Curiosity Class 7 Science Chapter 10 Life Processes in Plants Case Study Questions
- Curiosity Class 7 Science Chapter 9 Life Processes in Animals Case Study Questions
- Curiosity Class 7 Science Chapter 8 Measurement of Time and Motion Case Study Questions
- Curiosity Class 7 Science Chapter 7 Heat Transfer in Nature Case Study Questions
- Curiosity Class 7 Science Chapter 6 Adolescence: A Stage of Growth and Change Case Study Questions
- Curiosity Class 7 Science Chapter 5 Changes Around Us: Physical and Chemical Case Study Questions
- Curiosity Class 7 Science Chapter 4 The World of Metals and Non-metals Case Study Questions
- Curiosity Class 7 Science Chapter 3 Electricity: Circuits and their Components Case Study Questions
- Curiosity Class 7 Science Chapter 2 Exploring Substances: Acidic, Basic, and Neutral Case Study Questions
- Curiosity Class 7 Science Chapter 1 The Ever-Evolving World of Science Case Study Questions
🚀 Boost Your Exam Prep: Get case study questions for all subjects (Class 6-12) now!
👉 Explore more resources on CBSE Class 7
Topics from which case study questions may be asked
- Indicators
- Acids and bases
- Neutralization reactions
Acids and bases are everywhere — from the lemon you eat to the soap you use.
Frequently Asked Questions (FAQs) on Exploring Substances: Acidic, Basic, and Neutral Case Study Questions
Q1: What are case study questions in Exploring Substances: Acidic, Basic, and Neutral?
A1: These are competency-based questions based on real-life situations and concepts from Exploring Substances: Acidic, Basic, and Neutral.
Q2: Are case study questions part of Class 7 Science CBSE exams?
A2: Yes, CBSE includes such questions in line with NEP guidelines.
Q3: How can I practice Class 7 case study questions?
A3: Practice from chapterwise question banks and NCERT-integrated sources.
Q4: Are answers provided for Exploring Substances: Acidic, Basic, and Neutral case study questions?
A4: Yes, each case study question includes an answer.
Q5: Are there any online resources or tools available for practicing class 7 science curiosity “Exploring Substances: Acidic, Basic, and Neutral” case study questions?
A5: We provide case study questions for CBSE Class 7 Science Curiosity on our website. Students can visit the website and practice sufficient case study questions and prepare for their exams. If you need more case study questions, then you can visit Physics Gurukul website. they are having a large collection of case study questions for all classes.
