NCERT Solutions for Class 8 Science Science - NCERT Solution Chapter 4

Materials : Metals and Non-Metals Class 8

Chapter 4 Materials : Metals and Non-Metals Exercise Solutions

<< Previous Chapter 3 : Synthetic Fibres and Plastics Next Chapter 5 : Coal and Petroleum >>

Exercise : Solutions of Questions on Page Number : 53

Q1 :  

Which of the following can be beaten into thin sheets?

(a) Zinc (b) Phosphorus (c) Sulphur (d) Oxygen


Answer :

(a) Zinc

Answer needs Correction? Click Here

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

However, mercury metal- a liquid at room temperature - cannot be drawn into wires and is not ductile.

Answer needs Correction? Click Here

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 :

Please Register/Login to get access to all solutions Facebook Login
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 :

Please Register/Login to get access to all solutions Facebook Login
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 :

Please Register/Login to get access to all solutions Facebook Login
Q6 :  

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.


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q7 :  

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


Answer :

Please Register/Login to get access to all solutions Facebook Login
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 :

Please Register/Login to get access to all solutions Facebook Login
Q9 :  

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.


Answer :

Please Register/Login to get access to all solutions Facebook Login
Q10 :  

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.


Answer :

Please Register/Login to get access to all solutions Facebook Login
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 :

Please Register/Login to get access to all solutions Facebook Login
<< Previous Chapter 3 : Synthetic Fibres and Plastics Next Chapter 5 : Coal and Petroleum >>

Science - NCERT Solution - Science : CBSE NCERT Exercise Solutions for Class 8th for Materials : Metals and Non-Metals will be available online in PDF book form soon. The solutions are absolutely Free. Soon you will be able to download the solutions.

Popular Articles