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NCERT Solutions For Class 8 Science 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.

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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:

(c) Generally, metals are ductile. - Correct

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.

(c) Iron is more reactive than copper.

(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.

(c) Copper displaces zinc from zinc sulphate solution. (F)

-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
4.1Physical Properties of Metals and Non-metals
4.2Chemical Properties of Metals and Non-metals
4.3Uses 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

NCERT Solutions For Class 8th: Subject-wise

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


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 Question (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  

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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 3.8×107 J 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

Option 1)

less than 3

Option 2)

more than 3 but less than 6

Option 3)

more than 6 but less than 9

Option 4)

more than 9

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