Chapter 3 of Science Subject of Class 10 is “Metals and Non metals”. NCERT Solutions (Intext and End Exercise Questions) for Science Chapter 3 are provided on this page.

Class 10 Science Chapter 3 Metals and Non Metals

Chapter 3 of Class 10 Science NCERT Text book is Metals and Non Metals. The end exercise of this chapter consists of a total of 16 question. These end exercise questions are related to properties of metals and on metals.

It contains questions whose concepts are related to metallic properties , uses and preparation of metals and non metals, ore enrichment of ore ,etc You will find the NCERT solution of each question of Class 10 Science Chapter 3 on this post.

Chapter 3 : Metals and Non Metals ( NCERT Solutions )

Subject	Science
Class	10
Chapter	Chapter 3 : Metals and Non Metals
Study Material	NCERT Solutions ( End Exercise and Intext Questions )
Total Questions	16 Questions
Text Book	NCERT Text Book ( Updated Syllabus)

Question 1 :
Which of the following pairs will give displacement reactions?
(a) NaCl solution and copper metal
(b) MgCl₂ solution and aluminium metal
(c) FeSO₄ solution and silver metal
(d) AgNO₃ solution and copper metal.

Option [ d ] “AgNO₃ ” is correct answer.

Question 2 :
Which of the following methods is suitable for preventing an iron frying pan from rusting?
(a) Applying grease
(b) Applying paint
(c) Applying a coating of zinc
(d) All of the above.

Option [ a ] “applying a coating of zinc” is correct answer.

Question 3 :
An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be
(a) calcium
(b) carbon
(c) silicon
(d) iron.

Option [ a ] “Calcium” is correct answer.

Question 4 :
Food cans are coated with tin and not with zinc because
(a) zinc is costlier than tin.
(b) zinc has a higher melting point than tin.
(c) zinc is more reactive than tin.
(d) zinc is less reactive than tin.

Option [ c ] “Zinc is more reactive than tin” is correct answer.

Question 5 :
You are given a hammer, a battery, a bulb, wires and a switch.
(a) How could you use them to distinguish between samples of metals and non-metals?
(b) Assess the usefulness of these tests in distinguishing between metals and non-metals.

(i) hammer contain the metal in thin sheets.
a battery about wire and switch can be used to make circuit . Samples of metals and non-metals can be place between the circuit to distinguish between them.
(ii) The test depicts the characteristics of metals and non-metals so they are useful.

Question 6 :
What are amphoteric oxides? Give two examples of amphoteric oxides

Metal oxide which show basic as well as acidic characteristics, that is, they can react with acid and base are called amphoteric oxides. For example – Aluminium oxide and zinc oxide.

Question 7 :
Name two metals which will displace hydrogen from dilute acids, and two metals which will not

(i) Zinc and Iron will displace hydrogen from dilute acids.
(ii) Copper and Silver will not displace hydrogen from dilute acids

Question 8 :
In the electrolytic refining of a metal M, what would you take as the anode, the cathode and the electrolyte?

(i) anode : impure metals
(ii) Cathode : Pure Metals
(iii) Electrolyte : A Solution of metal salt.

Question 9 :
Pratyush took sulphur powder on a spatula and heated it. He collected the gas evolved by inverting a test tube over it, as shown in figure below.
(a) What will be the action of gas on (i) dry litmus paper? (ii) moist litmus paper?
(b) Write a balanced chemical equation for the reaction taking place.

(a) (i) dry litmus paper : No Action
(ii) Moist litmus paper : SO2 dissolves in water to form sulphurous acid which turns blue litmus red
(b) S + O₂ -> SO₂
SO₂ + H₂O -> H₂SO₃

Question 10 :
State two ways to prevent the rusting of iron

Ways to Prevent the rusting of iron.
1. Galvanisation
2. Alloyin

Question 11 :
What type of oxides are formed when non-metals combine with oxygen?

It will form either acidic or neutral oxides.

Question 12 :
Give reasons
(a) Platinum, gold and silver are used to make jewellery.
(b) Sodium, potassium and lithium are stored under oil.
(c) Aluminium is a highly reactive metal, yet it is used to make utensils for cooking.
(d) Carbonate and sulphide ores are usually converted into oxides during the process of extraction.

(a) Platinum, Gold and silver are news to make jewelry because they have bright shiny surface and high resistance to corrosion . Also they have high malleability and ductility
(b) Sodium , Potassium and lithium are stored under oil because these metals are very reactive . They catches fire vigorously when come in contact with air, water and oxygen.
(c)Aluminium forms a non-reactive layer of aluminium oxide on its surface. This layer prevents aluminium to react with other substances .
(d) Carbonate and sulphide ores are usually converted into oxides during the process of extraction because it is easier to obtain metals from their oxides as compared to carbonates and sulphides.

Question 13 :
You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Explain why these sour substances are effective in cleaning the vessels

Being acidic in nature , the lemon and tamarind juice come in contact with copper vessels due to which they neutralise the layer of oxides formed on them.

Question 14 :
Differentiate between metal and non-metal on the basis of their chemical properties.

Difference between Metals and Non Metals on the basis of their chemical properties.

Metal	Non Metals
Metals form basic oxides.	Non metals form either acidic or neutral oxides
Most of the metals H2 from water / steam.	Non metals do not displace H2 from steam or water
Metals are electro-positive elements and hence lose one or more electrons to form positive ions.	non Metals are electro-negative elements and hence gain one or more electrons to form negative ions.

Question 15 :
A man went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was upset but after a futile argument the man beat a hasty retreat. Can you play the detective to find out the nature of the solution he had used?

The dishonest goldsmith dipped the gold bangles in aqua-regia
Aqua-regia dissolved a considerable amount of gold from gold bangles and hence reduced their weight drastically. The dishonest goldsmith can recover the dissolved gold from aqua-regia by a suitable treatment.
Aqua – regia contains 1 part of concentrated nitric acid and 3 parts of concentrated hydrochloric acid, by volume

Question 16 :
Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron).

Copper is used to make hot water tanks because copper does not react with steam and does not corrode. But steel react with water / steam and corrode.