NCERT Solutions For Class 8 Science Chapter 4

NCERT Solutions Class 8 Science Materials Metals and Non Metals

Ncert Solutions For Class 8 Science Chapter 4 PDF Download

 

NCERT solutions class 8 science chapter 4 materials metals and non metals is one of the most important chapters in class 8 science section. The class 8 science chapter 4 NCERT solutions materials metals and non metals is given here so that students can learn the chapter in a better way. Students must learn the concepts of metals and nonmetals properly as it will be helpful for them in higher standards. The NCERT solutions for class 8 science chapter 4 is prepared according to the latest CBSE syllabus. Check the science chapter 4 class 8 NCERT solutions pdf given below.

The chapter covers the following topics

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

Question-1

Which of the following can be beaten into thin sheets?

(i) Phosphorus (ii) oxygen (iii) zinc (iv) sulphur

Answer-

(iii) Zinc

 

Question-2

Which of the following statements is correct?

(i) Generally, metals are ductile

(ii) All metals are ductile

(iii) Some non-metals are ductile

(iv) All non-metals are ductile

Answer-

(i) Generally, metals are ductile.

Mercury is a metal and it is liquid at room temperature, hence it cannot be drawn into sheets and it is not ductile.

 

Question-3

Fill in the blanks with appropriate words:

(i) Iron is                  reactive than copper.

(ii) Phosphorus is a very                  non-metal.

(iii) To produce                   gas, metal reacts with an acid.

(iv) Metals are                    conductors of heat and

Answer-

(i) Iron is a more reactive than copper.

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

(iii) To produce hydrogen gas, metal reacts with an acid.

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

 

Question-4

Mark ‘True’ and ‘False’ of the following sentence:

(i) Sodium is a very reactive metal. ( )

(ii) Coal can be drawn into wires. ( )

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

(iv) Copper displaces zinc from zinc sulphate solution. ( )

Answer-

(i) Sodium is a very reactive metal. (True)

(ii) Coal can be drawn into wires. (False)

(iii) Generally, non-metals react with acids. (False)

(iv) Copper displaces zinc from zinc sulphate solutions. (False)

 

Question-5 

In the table given below distinguish between metals and non-metals according to their properties.

Properties Metals Non-metals
i) Appearance

ii) Ductility

iii) Malleability

iv) Hardness

v)Conduction of electricity.

vi) Heat conduction

 

Answer-

Properties Metals Non-metals
i) Appearance

ii) Ductility

 

iii)Malleability

 

iv) Hardness

v)Conduction of electricity.

vi) Heat conduction

 

Lustrous

Can be drawn into wires

Can be beaten into sheets

Hard

Good conductor

 

Good conductor

 

Dull

Cannot be drawn into wires

Cannot be beaten into sheets

Soft

Bad conductor

 

Bad conductor

 

Question-6

Give reason for the following:

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

(ii) Aluminium foils are used to wrap foods items.

(iii) Sodium and potassium are stored in kerosene.

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

Answer-

(i) In an aqueous solution, a metal can displace a less reactive metal from its salt. But zinc is more reactive than copper. And because of it, copper cannot displace zinc from its salt solution.

Cu(s) +ZnSO4 (aq)        No reaction

(ii) Aluminium foils are used to wrap foods items because aluminum metal is malleable and it can be beaten into foil.

(iii) Sodium and potassium are stored in kerosene because they are highly reactive elements and can easily catch fire with the contact of air.

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

 

Question-7

Do you think it is possible to store lemon pickle in an aluminum utensil?

Answer-

No, it is not possible to store lemon pickle in an aluminum utensil because lemon pickle contains an acid which can react with aluminum (metal) liberating hydrogen gas. This may spoil the pickle.

 

Question-8

Match the following with column A with column B

A B
a) Iron i) Wrapping food
b) Mercury ii) Jewellery
c) Carbon iii) Fuel
d) Gold iv) Thermometer
e)Copper v) Machinery
f) Aluminum vi) Electric Wires

 

Answer-

A B
a) Iron v) Machinery
b) Mercury iv) Thermometer
c) Carbon iii) Fuel
d) Gold ii) Jewellery
e)Copper vi) Electric Wires
f) Aluminum i) Wrapping food

 

Question-9

What happen when:

i) Iron nails are placed in copper sulphate solution?

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

Write word equations of the reaction involved

Answer-

i) 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

ii) when dilute sulphuric acid is poured on a copper plate, there will be evolution of hydrogen gas along with the formation of blue color crystal of copper sulphate.

CuSO4 + H2SO4       CuSO4 + H2

 

Question-10

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

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

b) Mention the equation of the reaction taking place in this process.

Answer-

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.

3

Carbon dioxide reacts with water to form carbonic acid, which turns blue litmus paper red

 

Question-11

Once Meera along with her mother went to the jeweler’s shop. Her mother gave old gold jewelry to the goldsmith to polish. Next day when they brought the jewelry back, they found that there was a slight loss in his weight. Can you suggest a reason for the loss in weight?

Answer-

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.

We live in a world where it is impossible to live without metals and non metals. Both metals and nonmetals have become an integral part of our life. The properties of both metals and nonmetals should be well versed. To avoid confusion between the two, it suggested to make a comparison table and learn it well. All the topics in the chapter are covered in the NCERT Solutions Class 8 Science Chapter 4. Download the free PDF provided here, if necessary, take a printout to keep it handy during the preparation of exams.

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