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

NCERT Solutions For Class 8 Science Materials Metals and Non Metals

Edited By Irshad Anwar | Updated on Sep 20, 2023 10:44 PM IST

NCERT Solutions For Class 8 Science Materials Metals and Non Metals

Get free access to NCERT Solutions for Class 8 Science Chapter 4 Materials Metals and Non-Metals: Have you ever noticed the difference in sound when an iron piece and a wooden piece are dropped? Do you know why they sound different? Because iron and wood are entirely different materials with different properties. You will have such questions while going through Metals and Non Metals Class 8. The Questions related to the properties of metals and nonmetals are discussed throughout the solutions in NCERT Class 8 Science Solutions Chapter 4 Materials Metals and Non-Metals. In the Class 8 Science Chapter 4 question answer, you will learn that some materials are hard, lustrous, malleable, ductile, sonorous, and good conductors of heat and electricity, while some other materials do not show these properties. Materials Metals and Non Metals Class 8 Solutions provide answers to each question in the 8th NCERT Textbook. These solutions are part of the NCERT Solutions for Class 8 Science. Continue reading to go through the questions and answers given in NCERT Solutions for Class 8 Science Chapter 4.

Class 8 Science Chapter 4 question answer will familiarise you with the chemical and physical properties of metals and non-metals. The topics such as physical properties, chemical properties, and uses of metals and non-metals are covered in Class 8 Science Chapter 4 NCERT Solutions. Class 8 Students must refer to the NCERT Solutions for Class 8 for other subjects to get all their queries resolved. Try to solve NCERT Textbook Questions. If you face any problem or if you want to understand any question in a better way then refer to the NCERT Solutions for other classes (6 to 12) that help students to perform better in exams.

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

According to the latest CBSE Syllabus 2023-24, chapter 'metals and non metals class 8' has been deleted.

Download PDF

Materials: Metals and Non-Metals Class 8 Science NCERT Textbook Questions Answers

Here are the detailed solutions to Metals and Non Metals Class 8:

Class 8 Science Chapter 4 Question Answer:

Q1. Which of the following can be beaten into thin sheets?

(a) Zinc

(b) Phosphorus

(c) Sulphur

(d) Oxygen

Answer:

(a) Zinc. It is a metal and can be beaten into sheets because metals are malleable.

Rest three options are non-metals which are not malleable.

NCERT Solutions for Class 8 Science Chapter 4

Q2. Which of the following statements is correct?

(a) All metals are ductile.

(b) All non-metals are ductile.

(c) Generally, metals are ductile.

(d) Some non-metals are ductile.

Answer:

Metals like sodium and potassium are soft and can be broken into pieces. They cannot be drawn into wires and hence are not ductile.

Materials Metals and Non Metals Class 8 Solutions

Q3. Fill in the blanks.

(a) Phosphorus is a very _________ non-metal.

(b) Metals are________ conductors of heat and ________ .

(c) Iron is__________ reactive than copper.

(d) Metals react with acids to produce________ gas.

Answer:

(a) Phosphorus is a very reactive non-metal.

(b) Metals are good conductors of heat and electricity.

(d) Metals react with acids to produce hydrogen gas.

Materials Metals and Non Metals Class 8 NCERT Solutions

Q4. Mark ‘T’ if the statement is true and ‘F’ if it is false.

(a) Generally, non-metals react with acids.

(b) Sodium is a very reactive metal.

(c) Copper displaces zinc from zinc sulphate solution.

(d) Coal can be drawn into wires.

Answer:

(a) Generally, non-metals react with acids. (F)

-Non-metals do not react with acids (because they cannot donate an electron to hydrogen ion).

(b) Sodium is a very reactive metal. (T)

-Sodium reacts with water to liberate heat. That is why it is kept in kerosene.

-Zinc is more reactive than copper. Hence, copper cannot displace zinc.

(d) Coal can be drawn into wires. (F)

- Coal is very brittle and breaks when force is applied.

Class 8 Science Chapter 4 Question Answer

Q5. Some properties are listed in the following table. Distinguish between metals and non-metals on the basis of these properties.

Properties	Metals	Non-metals
1. Appearance
2. Hardness
3. Malleability
4. Ductility
5. Heat Conduction
6. Conduction of Electricity

Answer:

Properties	Metals	Non-metals
1. Appearance	Lustrous	Non-lustrous
2. Hardness	Hard	Soft
3. Malleability	Can be beaten into sheets	Can't be beaten into sheets
4. Ductility	Can be drawn into wires	Can't be drawn into wires
5. Heat Conduction	Good conductor	Poor conductor
6. Conduction of Electricity	Good conductor	Poor conductor

Class 8 Science Chapter 4 NCERT Solutions

Q6 (a). Give reasons for the following.

Aluminium foils are used to wrap food items.

Answer:

Aluminium is malleable and hence can be beaten into thin sheets known as foils. Hence it is used to wrap food items.

NCERT Solutions for Class 8 Science Chapter 4:

Q6 (b). Give reasons for the following.

Immersion rods for heating liquids are made up of metallic substances.

Answer:

Metals are a very good conductor of heat. Hence immersion rods for heating liquids are made up of metallic substances to transfer heat to the liquid.

Materials Metals and Non Metals Class 8 Solutions:

Q6 (c). Give reasons for the following.

Copper cannot displace zinc from its salt solution.

Answer:

A higher reactive metal can displace less reactive metal from its aqueous salt solution. Hence, copper being less reactive than zinc, cannot replace it from a zinc sulphate solution.

Materials Metals and Non Metals Class 8 NCERT Solutions:

Q6 (d). Give reasons for the following.

Sodium and potassium are stored in kerosene.

Answer:

Sodium and potassium are very reactive metals and readily catches fire in the air. They cannot be kept in water as they react exothermically in water. Therefore they are stored in kerosene.

Class 8 Science Chapter 4 NCERT Solutions:

Q7. Can you store lemon pickle in an aluminium utensil? Explain.

Answer:

Lemon contains a mild acid known as citric acid. We know that metal reacts with an acid to liberate hydrogen gas. Hence lemon pickle can't be kept in an aluminium (a metal) utensil as it will react with citric acid to liberate hydrogen.

Class 8 Materials Metals and Non Metals NCERT Solutions

Q8. Match the substances given in Column A with their uses given in Column B.

A	B
(i) Gold	(a) Thermometers
(ii) Iron	(b) Electric wire
(iii) Aluminium	(c) Wrapping food
(iv) Carbon	(d) Jewellery
(v) Copper	(e) Machinery
(vi) Mercury	(f) Fuel

Answer:

A	B
(i) Gold	(d) Jewellery
(ii) Iron	(e) Machinery
(iii) Aluminium	(c) Wrapping food
(iv) Carbon	(f) Fuel
(v) Copper	(b) Electric wire
(vi) Mercury	(a) Thermometers

Materials Metals and Non Metals Class 8 Questions and Answers

Q9 (a). What happens when

Dilute sulphuric acid is poured on a copper plate?

Write word equations of the reactions involved.

Answer:

When dilute sulphuric acid is poured on a copper plate, bubbles of hydrogen gas forms on the plate. This is because copper is metal and metal reacts with an acid to liberate hydrogen gas.

Equation:

$\\ Cu\ (m) +\ H_{2}SO_{4}\ (aq)\ \rightarrow\ CuSO_{4}\ (l)\ \ \ +\ \ \ H_{2}\ (g) \\ Copper+\ \ Sulphuric\ acid \ \rightarrow Copper\ Sulphate+\ \ Hydrogen\ gas$

Class 8 Materials Metals and Non Metals NCERT Solutions:

Q9 (b). What happens when

Iron nails are placed in copper sulphate solution?

Write word equations of the reactions involved.

Answer:

We know that a more reactive metal displaces a less reactive metal from its salt solution. When iron nails are placed in copper sulphate solution, iron being more reactive than copper, displaces copper and forms ferrous(iron) sulphate salt and copper deposits on the iron nails. The blue colour solution turns into green.

$\\ Fe\ (m) +\ CuSO_{4}\ (aq)\ \rightarrow\ FeSO_{4}\ (aq)\ \ \ +\ \ \ Cu\ (m) \\ Iron+\ \ \ \ Copper\ Sulphate\rightarrow \ \ \ Ferrous\ Sulphate+\ \ Copper$

Class 8 Science Ch 4 Question Answer

Q10 (a). Saloni took a piece of burning charcoal and collected the gas evolved in a test tube.

How will she find the nature of the gas?

Answer:

After burning the charcoal and collecting the gas evolved in the test tube, add a few drops of water in the test tube. Cover the test tube and shake it well. Then put a few drops of the solution on blue litmus paper and red litmus paper. If the blue litmus turns red, the nature of the gas is acidic. But if the red litmus turns blue, the gas is basic.

Materials Metals and Non Metals Class 8 Questions and Answers:

Q10 (b). Saloni took a piece of burning charcoal and collected the gas evolved in a test tube.

Write down word equations of all the reactions taking place in this process.

Answer:

The reactions are as follows:

(i) Charcoal reacts with oxygen to form carbon dioxide gas.

$\\ \ \ C\ (s)\ \ \ \ \ \ \ + O_{2}\ (g) \ \ \ \rightarrow\ \ \ \ CO_{2}\ (g) \\Carbon\ \ \ \ \ \ Oxygen\ \ \ \ \ \ \ \ \ Carbon\ Dioxide \\\ _{from\ Charcoal}$

(ii) Carbon dioxide reacts with water to form carbonic acid, hence acidic in nature

$\\ CO_{2}\(g) \ \ \ \ \ \ \ \ \ \ \ + H_{2}O\ (l)\ \ \ \rightarrow\ \ \ H_{2}CO_{3}\(aq) \\ Carbon\ Dioxide\ \ \ \ Water\ \ \ \ \ \ \ Carbonic\ Acid$

Class 8 Chapter 4 Science Solutions:

Q11. 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?

Answer:

Aqua regia (mixture of HCl and $HNO_{3}$ in the ratio 3:1) is used to polish gold ornaments. When dipped in the liquid, the gold layer starts dissolving which causes a reduction in the weight. The outer unpolished layer dissolves and the layer becomes shiny.

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

Topics covered in Class 8 Science Chapter 4 Materials Metals and Non-Metals:

Section Name	Topic Name
4	Materials Metals and Non-Metals
4.1	Physical Properties of Metals and Non-metals
4.2	Chemical Properties of Metals and Non-metals
4.3	Uses of Metals and Non-metals

Important Subtopics in NCERT Class 8 Science Chapter 4:

Reaction with Oxygen
Reaction with Water
Reactions with Acids
Reactions with Bases
Displacement Reactions

NCERT Solutions For Class 8th Science: Chapter-wise

Chapter 1	Crop Production and Management
Chapter 2	Microorganisms Friend and Foe In Microorganisms
Chapter 3	Synthetic Fibres and Plastics
Chapter 4	Materials Metals and Non-Metals
Chapter 5	Coal and Petroleum
Chapter 6	Combustion and Flame
Chapter 7	Conservation of Plants and Animals
Chapter 8	Cell Structure and Functions
Chapter 9	Reproduction in Animals
Chapter 10	Reaching the Age of Adolescence
Chapter 11	Force and Pressure
Chapter 12	Friction
Chapter 13	Sound
Chapter 14	Chemical Effects of Electric Current
Chapter 15	Some Natural Phenomena
Chapter 16	Light
Chapter 17	Stars and the Solar System
Chapter 18	Pollution of Air and Water

NCERT Solutions For Class 8th: Subject-wise

NCERT Solutions for Class 8 Maths

NCERT Solutions for Class 8 Science

NCERT Solutions for Class 8 Science Chapter 4 Material Metals and Non-metals: Points to Remember

The main points to be noted after going through NCERT solutions for Class 8 Science chapter 4 Material Metals and Non-Metals

Metals are lustrous whereas non-metals are not.
Generally, metals are malleable and ductile. Non-metals are not malleable and not ductile.
Metals are good conductors of heat and electricity whereas non-metals are poor conductors.
Mercury is a liquid metal
Metals react with oxygen to produce metal oxides which are basic in nature. Non-metals react with oxygen to produce non- metallic oxides which are acidic in nature. Certain questions based on this are given in NCERT Solutions for Class 8
Some metals react with water to produce metal hydroxides and hydrogen gas. Generally, nonmetals do not react with water.
Metals react with acids and produce hydrogen gas and metal salts. Generally, non-metals do not react with acids.
Some metals react with bases to produce hydrogen gas
More reactive metals displace less reactive metals from their compounds in aqueous solutions.

Also, Check NCERT Books and NCERT Syllabus here

NCERT Books Class 8 Science

NCERT Syllabus Class 8 Science

NCERT Books Class 8

NCERT Syllabus Class 8

We hope you will ace your examination with the help of NCERT Solutions for Class 8 Science Chapter 4 Materials Metals and Non-Metals.

Frequently Asked Questions (FAQs)

1. How important is the chapter Material Metals and Non-Metals for coming classes

The concepts studied in the NCERT Class 8 chapter Material Metals and Non-Metals will be used in the chemistry part of coming classes. There are many reactions to be studied based on the properties of metals and non-metals

2. How many questions in NCERT Class 8 Science chapter 4 Material Metals and Non-Metals?

There are 11 questions in in NCERT Class 8 Science chapter 4 Material Metals and Non-Metals

3. What are the topics covered in NCERT Class 8 Science chapter 4?

Here are the topic covered in NCERT Class 8 Science chapter 4

Physical Properties of Metals and Non-metals
Chemical Properties of Metals and Non-metals

Reaction with Oxygen
Reaction with Water
Reactions with Acids
Reactions with Bases
Displacement Reactions

Uses of Metals and Non-metals

Also Read

NCERT Solutions for Class 8 Science Chapter 11 Force and Pressure

NCERT Solutions for Class 8 Science Chapter 10 Reaching The age of adolescence

NCERT Solutions for Class 8 Science Chapter 9 Reproduction in Animals

NCERT Solutions for Class 8 Science Chapter 7 Conservation of Plants and Animals

NCERT Solutions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics

NCERT Solutions for Class 8 Science Chapter 2 Microorganisms Friend and Foe

NCERT Syllabus for Class 8 2024-25 - Download All Subjects PDF

Articles

MPSOS 10th Result 2024 - Check MPSOS Class 10 December 2024 Exam Result @mpsos.nic.in

Oct 29, 2024

Education Loan for School Students in India – Eligibility, Benefits & Application Process

Oct 29, 2024

How to Track NSP Payment Status – Step-by-Step Guide for Scholarship Updates

Oct 29, 2024

TOSS SSC Time Table 2025, Telangana Open School Class 10 Exam Dates @telanganaopenschool.org

Oct 29, 2024

IB Primary Years Programme (PYP) – Curriculum Overview and Key Benefits

Oct 28, 2024

Importance of Internships in Student Life - 10 Points, 100 Words, 200 Words, 500 Words

Oct 28, 2024

Cambridge Advanced Curriculum: AS and A levels (Grade 11 & 12)

Oct 28, 2024

Cambridge School Fees 2024-25 | Admission, Tuition Fee for Cambridge IGCSE Schools

Oct 25, 2024

Online Courses After 10th

Sep 17, 2024

Pathology Lab Technician Courses - Duration, Fees, Eligibility

Eligibility Criteria

Application Process

Exam Pattern

View All School Exams

Get answers from students and experts

Popular Questions

A block of mass 0.50 kg is moving with a speed of 2.00 ms^-1 on a smooth surface. It strikes another mass of 1.00 kg and then they move together as a single body. The energy loss during the collision is

Option 1) $0.34\; J$	Option 2) $0.16\; J$
Option 3) $1.00\; J$	Option 4) $0.67\; J$

A person trying to lose weight by burning fat lifts a mass of 10 kg upto a height of 1 m 1000 times. Assume that the potential energy lost each time he lowers the mass is dissipated. How much fat will he use up considering the work done only when the weight is lifted up ? Fat supplies 3.8×10⁷J of energy per kg which is converted to mechanical energy with a 20% efficiency rate. Take g = 9.8 ms⁻² :

Option 1)

2.45×10⁻³ kg

Option 2)

6.45×10⁻³ kg

Option 3)

9.89×10⁻³ kg

Option 4)

12.89×10⁻³ kg

An athlete in the olympic games covers a distance of 100 m in 10 s. His kinetic energy can be estimated to be in the range

Option 1) $2,000 \; J - 5,000\; J$	Option 2) $200 \, \, J - 500 \, \, J$
Option 3) $2\times 10^{5}J-3\times 10^{5}J$	Option 4) $20,000 \, \, J - 50,000 \, \, J$

A particle is projected at 60⁰ to the horizontal with a kinetic energy $K$ . The kinetic energy at the highest point

Option 1) $K/2\,$	Option 2) $\; K\;$
Option 3) $zero\;$	Option 4) $K/4$

In the reaction,

$2Al_{(s)}+6HCL_{(aq)}\rightarrow 2Al^{3+}\, _{(aq)}+6Cl^{-}\, _{(aq)}+3H_{2(g)}$

Option 1) $11.2\, L\, H_{2(g)}$ at STP is produced for every mole $HCL_{(aq)}$ consumed	Option 2) $6L\, HCl_{(aq)}$ is consumed for ever $3L\, H_{2(g)}$ produced
Option 3) $33.6 L\, H_{2(g)}$ is produced regardless of temperature and pressure for every mole Al that reacts	Option 4) $67.2\, L\, H_{2(g)}$ at STP is produced for every mole Al that reacts .

How many moles of magnesium phosphate, $Mg_{3}(PO_{4})_{2}$ will contain 0.25 mole of oxygen atoms?

Option 1) 0.02	Option 2) 3.125 × 10^-2
Option 3) 1.25 × 10^-2	Option 4) 2.5 × 10^-2

If we consider that 1/6, in place of 1/12, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will

Option 1) decrease twice	Option 2) increase two fold
Option 3) remain unchanged	Option 4) be a function of the molecular mass of the substance.

With increase of temperature, which of these changes?

Option 1) Molality	Option 2) Weight fraction of solute
Option 3) Fraction of solute present in water	Option 4) Mole fraction.

Number of atoms in 558.5 gram Fe (at. wt.of Fe = 55.85 g mol^-1) is

Option 1) twice that in 60 g carbon	Option 2) 6.023 × 10²²
Option 3) half that in 8 g He	Option 4) 558.5 × 6.023 × 10²³

A pulley of radius 2 m is rotated about its axis by a force F = (20t - 5t²) newton (where t is measured in seconds) applied tangentially. If the moment of inertia of the pulley about its axis of rotation is 10 kg m² , the number of rotations made by the pulley before its direction of motion if reversed, is