NCERT Solutions Class 7 Science Curiosity Chapter 4 Question Answers

NCERT Solutions for Class 7 Science Chapter 4 Metals and Non-Metals offer clear, concept-based answers aligned with the 2025-26 CBSE syllabus. This chapter helps students understand the physical and chemical properties of metals and non-metals, including concepts like malleability, conductivity, and reactivity.

The solutions explain activities and textbook questions in a simple, step-by-step manner to enhance learning and exam preparation. These Class 7 Science NCERT solutions build a strong foundation for higher classes and competitive exams. Download the latest NCERT Class 7 Science Chapter 4 Metals and Non-Metals solutions PDF for effective revision and conceptual clarity.

Ncert Solutions for class 7 science chapter 4

NCERT Solutions for Class 7 Science Chapter 4 help students understand key differences between metals and non-metals through simple explanations and practical examples. These class 7 science chapter 4 solutions are aligned with the latest syllabus of the Class 7 Science Curiosity textbook.

From activities to concept-based learning, these NCERT solutions for Class 7 Science Chapter 4 cover every important point. Students can also find extra questions and question answers for thorough practice. Whether revising or learning for the first time, these resources make Class 7 Science Curiosity Chapter 4 question answer sessions easy and effective for exam preparation.

Class 7 Science Curiosity Chapter 4 Question Answers

NCERT Solutions for Class 7 Science Curiosity Chapter 4 Metals and Non-Metals help students understand important properties, reactions, and uses of metals and non-metals through activities and questions.

These solutions are based on the latest 2025–26 syllabus and aid in exam preparation. Check the detailed answers and activity solutions given below for complete understanding.

Activity 4.1: Let us explore

Q: Record the appearance, hardness, and effect of hammering for various materials.

Holistic Lens Question

Q: What could be the potential reason that it is generally considered that copper was discovered earlier as compared to iron?
A: Copper occurs in nature in a more usable form and is easier to extract. Iron requires more advanced smelting technology due to its higher melting point. That’s why copper was discovered and used earlier by civilizations like the Harappans.

Activity 4.2: Let us investigate

Q: What sound do you hear when you drop a metal spoon, coin, coal, and wood?
A:

• Metal spoon/coin: Produces a clear ringing sound → Sonorous

• Coal and wood: Produce a dull thud → Not sonorous

Activity 4.3: Let us investigate

Q: Which spoon gets hotter—metal or wooden—when placed in hot water? What does it show?

A: The metal spoon gets hotter. It shows that metals conduct heat well, while wood is a poor conductor of heat.

Activity 4.4: Let us design and create

Activity 4.5: Let us experiment

Conclusion: Rusting occurs only when both air and water are present.

Activity 4.6: Let us investigate

Q: What happens when magnesium burns in air?

A: Magnesium burns with a dazzling white flame to form white powder magnesium oxide. When mixed with water, it forms a basic solution that turns red litmus paper blue.

Activity 4.7: Let us experiment

Q: What happens when sulfur burns in air?

A: Sulfur burns to form sulfur dioxide gas. When this gas is dissolved in water, it forms sulfurous acid, turning blue litmus red → Hence, acidic in nature.

Activity 4.8: Let us explore

Q: What happens when sulfur powder is added to water?

A: No reaction is observed. This shows that non-metals like sulfur do not react with water like metals do.

Let Us Enhance Our Learning – Answers

1. Which metal is commonly used to make food packaging materials as it is cheaper, and its thin sheets can be folded easily into any shape?

Answer: (i) Aluminium

2. Which of the following metal catches fire when it comes in contact with water?

Answer: (iv) Sodium

3. State True [T] or False [F]:
(i) Aluminium and copper are examples of non-metals used for making utensils and statues. → False
(ii) Metals form oxides when combined with oxygen, the solution of which turns blue litmus paper to red. → False
(iii) Oxygen is a non-metal essential for respiration. → True
(iv) Copper vessels are used for boiling water because they are good conductors of electricity. → False (They are good conductors of heat, not electricity in this context.)

4. Why are only a few metals suitable for making jewellery?

Answer: Because only a few metals like gold and silver are malleable, ductile, non-reactive, and have an attractive appearance suitable for ornaments.

5. Match the uses:

6. What happens when oxygen reacts with magnesium and sulfur?

Answer:

• Magnesium + Oxygen → Magnesium oxide (basic)

• Sulfur + Oxygen → Sulfur dioxide → Sulfurous acid (acidic)
  Main difference: Magnesium forms a basic oxide, sulfur forms an acidic oxide.

7. Best material for a pan to boil water and why?

Answer: Copper or Iron – because they are good conductors of heat and can withstand high temperature.

8. Three iron nails dipped in oil, water, and vinegar – which will not rust and why?

Answer: Iron nail dipped in oil will not rust because oil prevents contact with air and water, thus avoiding rusting.

9. How do different properties of metals and non-metals determine their use?

Answer:

• Metals (strong, lustrous, ductile, conductive) are used in tools, wires, cookware, machines.

• Non-metals (non-lustrous, poor conductors) are used in respiration (oxygen), fertilisers (nitrogen), antiseptics (iodine), purification (chlorine).

10. Can sulfur be used to prevent iron rusting? Why/Why not?

Answer: No. Sulfur is a non-metal and does not form a protective layer. It is brittle and reactive, hence unsuitable.

11. Why is heating necessary before shaping iron tools?

Answer: Heating softens the iron, making it easier to shape using tools like hammers, without breaking.

NCERT Solutions for Class 7 Science Curiosity Chapter 4 Extra Question Answers

NCERT Solutions for Class 7 Science Curiosity Chapter 4 Extra Question Answers are designed to help students revise important concepts beyond the textbook. These extra questions cover topics like properties, uses, and reactions of metals and non-metals in daily life. They enhance exam preparation and concept clarity. Check the important extra question-answers given below for better understanding.

Ncert Solutions for Class 7 Sience Chapter 4 Extra Questions

1. What is malleability? Give two examples of malleable metals.
Answer: Malleability is the property of metals by which they can be hammered into thin sheets without breaking. Gold and aluminium are malleable metals.

2. Why are metals used to make cooking utensils?
Answer: Metals are good conductors of heat and can withstand high temperatures, making them ideal for cooking utensils.

3. What is sonority? Name a material that is not sonorous.
Answer: Sonority is the property of producing a ringing sound when struck. Wood is not sonorous.

4. Why do wires used in electrical appliances have a plastic covering?
Answer: The plastic covering is a poor conductor of electricity and prevents electric shock.

5. Why are electrical wires made of copper and not coal?
Answer: Copper is a good conductor of electricity, while coal is a poor conductor.

6. What is rusting? Which conditions are required for rusting?
Answer: Rusting is the formation of brown flaky deposits on iron due to reaction with air and water. Moisture and oxygen are necessary for rusting.

7. Why is sodium stored in kerosene?
Answer: Sodium is highly reactive with water and oxygen. It is stored in kerosene to prevent it from catching fire.

8. Name two non-metals essential for life and explain their uses.
Answer:

• Oxygen: Required for respiration.

• Carbon: Basic building block of life; forms proteins, fats, and carbohydrates.

9. What is the nature of magnesium oxide and sulfur dioxide?
Answer: Magnesium oxide is basic; sulfur dioxide forms sulfurous acid, which is acidic in nature.

10. Why is gold used in making jewellery?
Answer: Gold is highly malleable, ductile, non-reactive, and has an attractive lustre, making it suitable for ornaments.

11. What is ductility? Give one example.
Answer: Ductility is the property of metals to be drawn into wires. Example: Copper.

12. Define corrosion. Give two examples of metals that undergo corrosion.
Answer: Corrosion is the gradual deterioration of metals due to air, water, or chemicals. Iron rusts, copper forms a green coating.

13. What are conductors? Name two poor conductors.
Answer: Conductors are materials that allow heat or electricity to pass through. Rubber and wood are poor conductors.

14. Give two differences between metals and non-metals.
Answer:

• Metals are malleable and ductile; non-metals are brittle.

• Metals are good conductors of heat and electricity; non-metals are poor conductors.

15. What is galvanisation?
Answer: Galvanisation is the process of coating iron with a layer of zinc to prevent rusting.

NCERT Solutions for Class 7 Science Curiosity Chapter 4 PDF Download

NCERT Solutions for Class 7 Science Curiosity Chapter 4 PDF Download is available below to help students access all solutions in one place.

This PDF includes detailed answers to textbook questions, activity responses, and extra questions from Chapter 4 – Metals and Non-Metals, based on the latest CBSE Class 7 Science 2025–26 syllabus.

It is a helpful resource for quick revision, homework support, and exam preparation. You can view and download the complete PDF of NCERT solutions for Chapter 4 from the section given below.

Benefits of Using NCERT Solutions for Class 7 Science Curiosity Chapter 4 

Below we have provided the beenfits of using NCERT Solutions for Class 7 Science Curiosity Chapter 4 - 

• Aligned with Latest Syllabus (2025–26):
  Solutions strictly follow the updated NCERT Curiosity textbook, ensuring complete syllabus coverage.

• Step-by-Step Concept Clarity:
  Every answer is explained clearly, helping students understand properties like malleability, ductility, and conductivity.

• Supports Activity-Based Learning:
  Includes responses to all in-text activities, experiments, and observations, as per the inquiry-based learning approach.

• Boosts Exam Preparation:
  With extra questions, true/false, flow charts, and match-the-following, it prepares students for school exams and Olympiads.

• Time-Saving Resource:
  Acts as a ready reference for daily homework, class tests, and last-minute revision.

• Foundation for Higher Classes:
  Builds strong fundamentals of Chemistry and Material Science useful in Classes 8, 9, and beyond.