The World of Metals | Class 7 Science Notes
By ConceptScroll Team · Published on 17 July 2026 · 3 min read
The World of Metals – this guide gives you a concise, exam-ready overview of The World of Metals from Class 7 Science, written by ConceptScroll editors and reviewed against the latest NCERT textbook.
4.5 Are Non-metals Essential in Everyday Life?
This section emphasizes the vital role of non-metals in daily life despite the prominence of metals. Oxygen, a non-metal, is essential for respiration and survival. Carbon is fundamental as the building block of all life forms, forming proteins, fats, and carbohydrates necessary for growth and energy. Nitrogen is crucial for plant growth, used in fertilizers and chemicals. Chlorine is widely used for water purification, ensuring safe drinking water. Iodine solutions serve as antiseptics for wound treatment. The section highlights that non-metals have diverse and indispensable roles in biological processes, agriculture, health, and sanitation. It also notes that metals and their alloys are important in technology and industry, including atomic energy and aerospace applications. Recycling of metals like iron and aluminium in India contributes to sustainability. This section bridges the understanding of metals and non-metals by focusing on their complementary importance in society and technology.
📊 Diagram: Images show various applications of metals and non-metals in daily life and industry.
🔗 Connection: This section leads to the summary of the chapter and exercises to reinforce learning.
Frequently asked questions
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? (i) Aluminium (ii) Copper (iii) Iron (iv) Gold
The correct answer is (i) Aluminium. Aluminium is commonly used for food packaging because it is cheap, lightweight, and its thin sheets can be easily folded into various shapes without breaking.
2. Which of the following metal catches fire when it comes in contact with water? (i) Copper (ii) Aluminium (iii) Zinc (iv) Sodium
The correct answer is (iv) Sodium. Sodium is a highly reactive metal that catches fire when it comes in contact with water due to its vigorous reaction producing sodium hydroxide and hydrogen gas, which ignites.
3. State with reason(s) whether the following statements are True [T] or False [F]. (i) Aluminium and copper are examples of non-metals used for making utensils and statues. [ ] (ii) Metals form oxides when combined with oxygen, the solution of which turns blue litmus paper to red. [ ] (iii) Oxygen is a non-metal essential for respiration. [ ] (iv) Copper vessels are used for boiling water because they are good conductors of electricity. [ ]
(i) False. Aluminium and copper are metals, not non-metals, and are used for making utensils and statues. (ii) False. Metals form basic oxides; their solutions turn red litmus blue, not blue litmus red. (iii) True. Oxygen is a non-metal essential for respiration. (iv) False. Copper vessels are used because copper is a good conductor of heat, not electricity.
4. Why are only a few metals suitable for making jewellery?
Only a few metals are suitable for making jewellery because they have properties like lustre, malleability, ductility, resistance to corrosion, and are non-toxic. Metals like gold, silver, and platinum possess these qualities, making them ideal for jewellery.
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