Ncert Class 8 Science Chapter 4 Materials: Metals and Non-Metals

Class 8 Science Chapter 4 NCERT Solutions – Free PDF Download

NCERT Solutions for Class 8 Science (Chemistry) Chapter 4 – Materials: Metals and Non-Metals solved by Expert Teachers as per NCERT (CBSE) Book guidelines are available for free PDF download at INFINITY LEARN.com, India’s No. 1 online tutoring website. Materials: Metals and Non-Metals (Chapter 4) Exercise Questions with Solutions will assist you in revising the entire syllabus and gaining a higher grade. Register for a free webinar with India’s greatest Science tutor. INFINITY LEARN is a website that offers students free NCERT solutions and other study tools.

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METALS AND NON-METALS

Metals and Non-metals

1. Which of the following can be beaten into thin sheets. [ ]
2. a) Zinc b) Phosphorus c) Sulphur d) Oxygen
3. Zinc
4. Which of the following statement is correct [ ]
5. a) All metals are ductile
6. b) All non – metals are ductile
7. c) Generally metals are ductile
8. d) Some non – metals are ductile
9. Generally metals are ductile
10. Fill in the blanks
11. a) Phosphorus is a very reactive non – metal.
12. b) Metals are good conductors of heat and
13. c) Iron is more reactive than copper.
14. d) Metals react with acids to produce hydrogen gas.
15. Mark ‘T’ if the statement is true and ‘F’ if it is false.
16. a) Generally non – metals react with acids [ F ]
17. b) Sodium is a very reactive metal [ T ]
18. c) Copper displaces Zinc from Zinc sulphate solution [ F ]
19. d) Coal can be drawn into wires [ F ]
20. Some properties are listed in the following table. Distinguish between metals and non – metals on the basis of these properties.

Properties	Metal	Non – Metal
1) Appearance	Metallic Lustre	Non – Lustrous
2) Hardness	Hard	soft
3) Malleability	Malleable	Non – malleable
4) Ductility	Ductile	Non – ductile
5) Heat conduction	good conductors	bad – conductors
6) Conduction of electricity	good conductors	bad – conductors

6. Give reason for following
7. a) Immersion rods for heating liquids are made up of Metallic substances: Immersion rods

are made up of metallic substances because metals are good conductors of heat and electricity

1. b) Aluminium is used to make electrical wires: Aluminium is good conductor of electricity.
2. c) Sodium and Potassium are stored in Kerosene : Sodium and Potassium metals are very

reactive because they react with oxygen and water easily, so that Sodium and Potassium are

always stored in kerosene.

7. Can you store Lemon pickle in an aluminium utensil? Explain
8. No. Lemon contains citric acid. Generally all acids react with metals like aluminium.
9. Match the substances given in Column A with their uses given in Column B.
10. Column – A Column – B
11. A) Gold [ 4 ] 1) Thermometers
12. B) Iron [ 5 ] 2) Electric wire
13. C) Aluminium [ 3 ] 3) Wrapping food
14. D) Carbon [ 6 ] 4) Jewellery
15. E) Copper [ 2 ] 5) Machinery
16. F) Mercury [ 1 ] 6) Fuel
17. What happen when
18. a) Dilute Sulphuric acid is poured into a Copper plate?
19. b) Iron nails are placed in Copper sulphate solution? Write word equations of the reactions involved?
20. a) Copper sulphate is formed and hydrogen gas is released Moderate reaction under hot condition

Copper + dilute Sulphuric acid Copper sulphate + Hydrogen gas

1. b) Brown coating is deposited on the Iron nails, because of the displacement of copper from Copper sulphate solution by Iron.

Iron + Copper sulphate (solution) Iron sulphate solution + Copper (pure metal)

10. Saloni took a piece of burning charcoal and collected the gas evolved in a test tube
11. a) How will she find the nature of the gas?
12. b) Write down word equations of all the reactions taking place in this process?
13. a) Burning charcoal releases CO2 gas. When wet litmus paper in contact with the gas, gas turns wet blue litmus paper into red, then the gas will be acidic.
14. b) i) Carbon + oxygen Carbondioxide
15. ii) Carbondioxide + water Carbonic acid (from wet litmus)
16. One day Reeta went to a jeweller’s shop with her mother. Her mother gave an old gold jewellery to the goldsmith to polish. Next day when they brought the jewellery back, they found that there was a slight loss in its weight. Can you suggest a reason for the loss in weight?
17. The gold jewellery is dipped into an acidic solution called aqua regia (a mixture of hydrochloric acid and nitric acid) for polishing. On dipping the gold jewellery in the acid solution, the outer layer of gold dissolves and the inner shiny layer appears. This causes a slight loss in its weight.

Materials: Metals and Non-Metals NCERT Solutions for Class 8 Science Chapter 4

Materials: Metals and Non-Metals, Chapter 4 of NCERT Grade 8 Science, explores the universe of metals and non-metals, as well as their qualities and applications. This chapter will assist students in categorizing elements as metals or non-metals based on their properties. Some of the main topics covered in this chapter include the physical properties of metals and non-metals, the chemical properties of metals and non-metals, and the uses of metals and non-metals.

The first section of the chapter uses visuals, graphs, and examples from everyday life to discuss the durability, malleability, luster, hardness, and other attributes of metals and nonmetals.

The following section discusses the chemical reactions of metals and nonmetals with oxygen, water, acids, and bases. This will aid students in comprehending the chemical properties of metals and non-metals, as well as their interactions.

The final portion of NCERT Grade 8 Science Chapter 4, Materials: Metals and Non-Metals, discusses the use of metals and non-metals in a variety of settings, including industries, factories, and domestic applications. Simple language, a plethora of games, exercises, and real-life examples make learning enjoyable and aid in long-term retention. This chapter is particularly imaginative and colourful, with new concepts, technical vocabulary, project work, and demonstrations.

Expert Science professors explain the NCERT Solutions for Class 8 Science Chapter 4 (Materials: Metals and Non-Metals) in detail. We provide answers to the questions in the Class 8 Science textbook using the most recent NCERT book for Class 8 Science, as per CBSE Board requirements. The following are the subjects and sub-topics in Chapter 4 Materials: Metals and Non-Metals.

Physical Properties of Metals and Non-metals (Ex. 4.1)

Chemical Properties of Metals and Non-metals (Ex. 4.2)

Metals and non-metals are used in Ex 4.3.

In the following chapter, we go over all of the exercises: –

11 Questions and Answers in Chapter 4

In addition to the exercises, you should practice all of the solved cases in the book to solidify your understanding of Metals and Non-Metals. Take a printout of Chapter 4 Materials: Metals and Non-Metals from the free PDF and keep it ready for exam preparation.

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