NCERT Solutions for Class 7 Science Curiosity Chapter 2 Question Answers

NCERT Solutions for Class 7 Science Curiosity Chapter 2 help students build a clear understanding of key science concepts as per the latest CBSE syllabus and exam pattern. These well-structured solutions support exam preparation by offering step-by-step answers aligned with NCERT guidelines.

Practicing these solutions alongside previous year papers boosts confidence and improves conceptual clarity. Whether you're revising for tests or completing assignments, these solutions make learning easier and more effective.

Ideal for self-study, they also help identify important topics often covered in exams, making them a valuable resource for scoring better in  Class 7 Science.

NCERT Class 7 Science Curiosity Ch 2 Solutions

Class 7 Science Curiosity Chapter 2, Exploring Substances: Acidic, Basic, and Neutral, introduces students to the chemical nature of substances and their classification based on their acidic, basic, or neutral properties. Understanding this chapter is essential as per the latest exam pattern, syllabus, and previous year papers, which often include conceptual and application-based questions.

These NCERT solutions provide accurate explanations, making learning easier and exam-focused. By mastering this topic, students can strengthen their foundation for future classes and competitive exams.

Class 7 science Chapter 2 Curiosity Question Answer

Below we have provided the NCERT Solutions for Class 7 Science Curiosity Chapter 2 Exploring Substances – Acidic, Basic, and Neutral. These well-structured answers will help students understand key concepts clearly and prepare effectively for exams.

All solutions are based on the updated syllabus and exam pattern, making revision and practice easier and more efficient for better academic performance.

Activities

Activity 1: Tasting Substances

Question:
List down any five substances you have tasted. Classify them as sour, bitter, or salty.

Answer:

Activity 2: Using Natural Indicators

Question: Using turmeric, test the nature of soap solution and lemon juice. Record the changes in colour.

Answer:

Class 7 Science Curiosity chapter 2 Exercises

Below we have provided the complete Class 7 Science Curiosity Chapter 2 Exercises with detailed answers. These solutions cover all textbook questions and activities related to Exploring Substances Acidic, Basic, and Neutral. They are designed to help students understand key concepts clearly, prepare for exams effectively, and build a strong foundation in chemistry through structured and easy explanations.

Q1: Define the following terms:

(a) Acidic substances
(b) Basic substances
(c) Neutral substances

Answer:

(a) Acidic substances are those which taste sour and turn blue litmus red. They include lemon juice, vinegar, etc.

(b) Basic substances are those which taste bitter and turn red litmus blue. Examples include baking soda and soap solution.

(c) Neutral substances neither turn blue nor red litmus and are neither sour nor bitter in taste. Water and salt are examples.

Q2: How will you test a substance to find out if it is acidic, basic or neutral?

Answer:
We can use indicators like litmus paper or natural indicators such as turmeric and china rose to test a substance:

• If blue litmus turns red → acidic

• If red litmus turns blue → basic

• If no change → neutral

Q3: What are natural indicators? Give two examples.

Answer:
Natural indicators are substances obtained from natural sources that help us identify whether a substance is acidic or basic.
Examples:

1. Turmeric

2. China rose petals

Q4: Explain the change in colour of turmeric paper when it comes in contact with soap solution.

Answer:
Turmeric turns reddish-brown in the presence of a base. Soap solution is basic in nature, so turmeric paper changes its colour to reddish-brown when it comes into contact with it.

Q5: Which of the following substances are acidic, basic or neutral? Classify them accordingly.

Lemon juice, toothpaste, milk, vinegar, baking soda, salt water, curd, soap solution

Answer:

Q6: What happens when an acidic solution is mixed with a basic solution?

Answer:
When an acidic solution is mixed with a basic solution, they neutralize each other. This reaction forms salt and water and is known as neutralization reaction.

Q7: Why should we not taste unknown substances in the laboratory?

Answer:
We should not taste unknown substances in the laboratory because:

• They may be harmful or poisonous.

• Some substances can cause burns or irritation.

• Lab substances may be contaminated.

NCERT Solutions for Class 7 Science Curiosity Chapter 2 Extra Question Answers

Below we have provided the NCERT Solutions for Class 7 Science Curiosity Chapter 2 Extra Question Answers to help students strengthen their understanding of the chapter Exploring Substances – Acidic, Basic, and Neutral. These additional questions cover important concepts, practical examples, and application-based reasoning that support exam preparation and improve overall conceptual clarity for better academic performance.

Q1. What is the taste of most acidic substances?
Answer: Most acidic substances have a sour taste.

Q2. Name two substances that are basic in nature and used at home.
Answer: Soap solution and baking soda are basic substances commonly used at home.

Q3. What is an indicator?
Answer: An indicator is a substance that changes its colour to show whether a solution is acidic or basic.

Q4. Name two natural indicators.
Answer: Turmeric and china rose extract are two natural indicators.

Q5. What colour does blue litmus turn in an acid?
Answer: Blue litmus turns red in an acid.

Q6. What is a neutral substance? Give one example.
Answer: A neutral substance is neither acidic nor basic. Water is an example.

Q7. What is formed when an acid reacts with a base?
Answer: Salt and water are formed in a neutralization reaction between an acid and a base.

Q8. Why should we not taste laboratory substances?
Answer: We should not taste lab substances because they may be harmful, toxic, or corrosive.

Q9. How does turmeric react with a base like soap?
Answer: Turmeric turns reddish-brown when it reacts with a basic substance like soap.

Q10. What happens to red litmus in a basic solution?
Answer: Red litmus turns blue in a basic solution.

Q11. Define neutralization with an example.
Answer: Neutralization is the reaction between an acid and a base to form salt and water. For example, hydrochloric acid reacts with sodium hydroxide to form sodium chloride and water.

Q12. What does the china rose indicator show in acidic solution?
Answer: China rose indicator turns dark pink or magenta in acidic solution.

Q13. Is vinegar acidic or basic? What is its taste?
Answer: Vinegar is acidic and has a sour taste.

Q14. What does salt water taste like and what is its nature?
Answer: Salt water tastes salty and is generally neutral in nature.

Q15. What is the importance of using indicators in science experiments?
Answer: Indicators help us identify the chemical nature (acidic or basic) of a substance, making it easier to handle and use substances safely in experiments.

NCERT Solutions for Class 7 Science Curiosity Chapter 2 PDF Download

Below we have provided the NCERT Solutions for Class 7 Science Curiosity Chapter 2 PDF Download for easy access and offline study. This PDF includes all textbook exercises, activity-based answers, and extra questions to support thorough preparation. Designed as per the latest syllabus and exam pattern, it helps students understand concepts clearly and revise effectively. Click the link below to download the complete and reliable solution set in PDF format.