NCERT Solutions For Class 8 Science Chapter 4- Materials : Metals And Non Metals

NCERT Solutions For Class 8 Science Chapter 4 PDF Free Download

NCERT solutions for class 8 science chapter 4 Materials Metals and Nonmetals provided here is one of the most important resources for class 8 students.

The metals and nonmetals solutions are given here so that students can clear their doubts easily and learn the chapter in a more efficient way. Students must learn the concepts of metals and nonmetals properly as it will be helpful for them in higher standards.

All the NCERT solutions for class 8 science are prepared according to the latest CBSE syllabus. Check the science chapter 4 class 8 NCERT solutions pdf given below.

Download PDF of NCERT Solutions for Class 8 Science Chapter 4 Materials: Metals and Non Metals

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NCERT solutions for class 8 science chapter 4 part 4

Access Answers of Science NCERT class 8 Chapter 4 Materials: Metals and Non Metals

Exercise Questions

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

(a) Zinc

(b) Phosphorus

(c) Sulphur

(d) Oxygen

Soln:

Answer is a) Zinc

Explanation:

Here, Zinc is a metals with malleability and ductility whereas Phosphorus, Sulphur and Oxygen are nonmetals which lack malleability and ductility.

2. 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.

Soln:

Answer is (c) Generally, metals are ductile.

Explanation:

Ductility is a property where a substance can be drawn into thin wires, Generally metals are ductile with mercury as the exception.

3. 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.

Soln:

(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.

4. 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. ( )

Soln:

a) False

b) True

c) False

d) False

5. 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

Soln:

Properties Metals Non-metals
1. Appearance Lustrous Dull
2. Hardness Hard Soft
3. Malleability Have property of Malleability Do not have property of Malleability
4. Ductility Have property of Ductility Do not have property of Ductility
5. Heat Conduction Good conductor of Heat Bad Conductor of Heat
6. Conduction of Electricity Good conductor of Electricity Bad conductor of Electricity

6. Give reasons for the following.

(a) Aluminium foils are used to wrap food items.

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

(c) Copper cannot displace zinc from its salt solution.

(d) Sodium and potassium are stored in kerosene

Soln:

a) Aluminium is malleable and can be drawn into thin sheets hence Aluminium foils are used to wrap food items

b) Immersion rods for heating liquids are made up of metallic substances because metals are good conductors of heat and electricity.

c) Copper cannot displace zinc from its salt solution because Zinc is more reactive than copper.

d) Sodium and Potassium are highly reactive metals which readily reacts with atmospheric Oxygen to catch fire hence Sodium and Potassium are stored in kerosene.

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

Soln:

Pickle consists of acids which reacts with Aluminium metal to prduce salt and Hydrogen. Hence pickle are not stored in aluminium utensil.

8. 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

Soln:

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

9. What happens when

(a) Dilute sulphuric acid is poured on a copper plate?

(b) Iron nails are placed in copper sulphate solution?

Write word equations of the reactions involved.

Soln:

i) When dilute sulphuric acid is poured on a copper plate, hydrogen gas evolves along with the formation of blue color crystal of copper sulphate.

CuSO4 + H2SO4 →      CuSO4 + H2

ii) Iron being more reactive displaces copper from copper sulphate. In this reaction, the blue color of copper sulphate fades and there is deposition of copper on the iron nail.

Fe + CuSO4  →      FeSO4 + Cu

 

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

(a) How will she find the nature of the gas ?

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

Soln:

a) In a test tube containing gas, add a few drops of water. Now cover the test tube and shake well. After shaking, test the solution with blue litmus and red litmus. It will change from blue to red. Thus, the gas is acidic in nature.

b) Charcoal reacts with oxygen to form carbon dioxide gas.

Reaction of charcoal with Oxygen

11. 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?

Soln:

In order to polish the gold ornament, it is to be dipped into a liquid called aqua regia (a mixture of hydrochloric acid and nitric acid). On getting dissolved in the environment of aqua regia, the outer layer of gold dissolves and an inner shiny layer appears. The dissolving of the layer causes a reduction in the weight of the jewelry.

Topics covered in NCERT Solutions class 8 Science chapter 4 materials metals and nonmetals

Section Number Topic
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

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Frequently Asked Questions on Chapter 4 Materials: Metals and Non Metals

Which of the following can be beaten into thin sheets? (a) Zinc (b) Phosphorus (c) Sulphur (d) Oxygen

(b) Zinc

Can you store lemon pickle in an aluminium utensil?

Pickle consists of acids which reacts with Aluminium metal to prduce salt and Hydrogen. Hence pickle are not stored in aluminium utensil.

3 Comments

  1. Best solution website

  2. Nakul Dev Singh Rathore

    In the question number 9th there is a problem it is written that dilute sulphuric acid reacts with copper and produce hydrogen gas but the but it does not react with it it reacts with the concentrated sulphuric acid by juice this is wrong answer

    1. Dear Nakul,

      The answer stated is as given below:
      “When dilute sulphuric acid is poured on a copper plate, hydrogen gas evolves along with the formation of blue color crystal of copper sulphate.”

      We have nowhere mentioned that dilute sulphuric acid reacts with copper to produce hydrogen gas. What is mentioned are the reactants of the reaction

      Thanks

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