NCERT Solutions for Class 10 Science Chapter 3
NCERT Solutions for Class 10 Science Chapter 3 Metals and Non-Metals intext questions given on Page 40 or Page 46 or Page 49 or Page 53 or Page 55 or Exercises in English Medium updated for new session 2021-22.The Hindi Medium version of solutions including Page 45 ke Uttar or Page 51 ke Uttar or Page 54 ke Uttar or Page 59 ke Uttar or Page 61 ke Uttar or Abhyas ke Prashn Uttar are also given to study online or download in PDF format free. NCERT Books and Offline Solutions Apps 2021-22 based on latest CBSE Syllabus 2021-22 are also available to download.
NCERT Solutions for Class 10 Science Chapter 3
10th Science Chapter 3 Answers in English Medium
10th Science Chapter 3 Answers in Hindi Medium
10th Science Chapter 3 Answers in PDF Format
- 10th Science Page 40 Answers in PDF
- 10th Science Page 46 Answers in PDF
- 10th Science Page 49 Answers in PDF
- 10th Science Page 53 Answers in PDF
- 10th Science Page 55 Answers in PDF
- 10th Science Chapter 3 Exercises in PDF
- 10th Science Chapter 3 Study Material in English
- 10th Science Chapter 3 Study Material in Hindi
- 10th Science Notes on Chapter 2
- Class 10 Science Solution Main Page
|Class: 10||Science (English and Hindi Medium)|
|Chapter 3:||Metals and Non-Metals|
10th Science Chapter 3 Answers in English & Hindi Medium
NCERT Solutions for Class 10 Science Chapter 3 Metals and Non-Metals all intext question answers and chapter end exercises are given below to free download or use online. All NCERT Solutions 2021-22 are updated for new academic session based on latest CBSE Syllabus 2021-2022.
Class 10 Science Chapter 3 Extra Question Answers
Why are aluminium and copper metals used for making cooking vessels?
Aluminium and copper metals are good conductor of heat. When exposed to air, these develop a layer of oxide. This makes it resistant to further corrosion.
Why is sodium kept immersed in kerosene oil?
Sodium is very reactive. If kept exposed to air, it catches fire.
Distinguish between calcinations and roasting.
(i) The ore is heated is absence of air.
(ii) It is used for carbonate ores.
(i) The ore is heated in the presence of air.
(ii) It is used for sulphide ores.
Ionic compounds have high melting point. Why? Give reason in support your answer.
In iconic compounds, ions are joined together due to powerful electrostatic forces, therefore, considerable energy is required to separate these ions and break the lattice. Thus ionic compounds have high melting points.
Generally, Ionic compounds are hard crystalline solids. Why?
There are solids due to strong force of attraction between oppositely charged ions resulting in the formation of hard crystalline lattice.
What are alloys?
An alloy is a homogeneous mixture of two or more metals, or a metals and a non-metal. It is prepared by first melting the main metal, and then dissolving the required amount of other metals or non-metals. This mixture is then cooled to form an alloy of a given composition.
What is meant by metallurgy?
Metallurgy involves various processes starting with the treatment of ore to getting metals in the pure form.
Questions for Practice
Compare the properties of a typical metal and non-metal on the basis of the following:
(i) nature of oxide formed by them
(i) Metals from basic oxide, e.g., sodium gives a basic oxide, Na2O. Non-metals from acidic oxide, e.g., sulphur gives an acidic oxide, SO2.
(ii) Metals have good conductivity, e.g., copper is a good conductor. Non-metals do not conduct heat or electricity, e.g., sulphur.
How is an ore different from a mineral?
“all ores are minerals but all minerals are not ores”. Justify the statement with examples.
The metals found in nature in combined state are called minerals. If some minerals contain a very high percentage of a particular metal and the metals can be profitably and economically extracted, then it is called an ore.
Questions from Board Papers
Atmospheric air always contains moisture. Then, how can you protect iron articles from the affect of atmosphere?
Iron articles can be protected from the effect of atmosphere by painting, oiling and greasing. This gives temporary protection to iron articles. For long time protection, galvanising or chrome plating are quite useful.
Explain, why some metals are more reactive and others less reactive and others less reactive?
What determines the reactivity of metals?
When metals react, they lose electrons to form positive ions. Such metals which can lose electrons easily to form positive ions when reacted with other substances, are reactive metals. On the other hand, if a metal loses electrons less rapidly to form positive ions, it will reacts slowly with other substances. Such a metal will be less reactive. For example, sodium atom is a very reactive metals because it readily loses one electron, forms a positive ion which then combines with other substances. On the other hand, lead atom loses electrons with difficulty to form positive ions, so lead metal is less reactive.
Important Questions on 10th Science Chapter 3
Name two metals which will displace hydrogen from dilute acids, and two metals which will not.
Metals that are more reactive than hydrogen displace it from dilute acids. For example: sodium and potassium. Metals that are less reactive than hydrogen do not displace it. For example: copper and silver.
What are the two important ways to prevent the rusting of iron?
Oiling, greasing, or painting: By applying oil, grease, or paint, the surface becomes water proof and the moisture and oxygen present in the air cannot come into direct contact with iron. Hence, rusting is prevented. Galvanisation: An iron article is coated with a layer of zinc metal, which prevents the iron to come in contact with oxygen and moisture. Hence, rusting is prevented.
Platinum, gold and silver are used to make jewellery. Why?
Platinum, gold, and silver are used to make jewellery because they are very lustrous. Also, they are very less reactive and do not corrode easily.
Why are Sodium, potassium and lithium stored under oil?
Sodium, potassium, and lithium are very reactive metals and react very vigorously with air as well as water. Therefore, they are kept immersed in kerosene oil in order to prevent their contact with air and moisture.
Aluminium is a highly reactive metal, yet it is used to make utensils for cooking. Why?
Though aluminium is a highly reactive metal, it is resistant to corrosion. This is because aluminium reacts with oxygen present in air to form a thin layer of aluminium oxide. This oxide layer is very stable and prevents further reaction of aluminium with oxygen. Also, it is light in weight and a good conductor of heat. Hence, it is used to make cooking utensils.
Carbonate and Sulphide ores are usually converted into oxides during the process of extraction. Why?
Carbonate and sulphide ores are usually converted into oxides during the process of extraction because metals can be easily extracted from their oxides rather than from their carbonates and sulphides.
Which questions of chapter 3 Metals and Non-Metals of grade 10th Science have a chance to come in the board exam?
Chapter 3 (Metals and Non-Metals) of grade 10th Science is important from the exam point of view. Every year questions come from chapter 3 in the exams. There are 28 questions in chapter 3. All the questions of this chapter are significant and can come in the exams. But the most important questions of this chapter that have more chance to come in the board exam are question 1 (page number 40), questions 1, 3, 4 (page number 46), questions 1, 2 (page number 49), question 3 (page number 53), questions 1, 2 (page number 55), and from back exercise questions 1, 6, 7, 8, 9, 12 are important.
Is there any book other than NCERT for chapter 3 of class 10th Science that students can refer to at the time of exams?
Yes, there is a book other than NCERT for chapter 3 of class 10th Science that students can refer to at the exam time. The name of this book is Lakhmir Singh and Manjit Kaur. This book is one of the best books after NCERT. The language of this book is students friendly. Students can easily prepare chapter 3 of class 10th Science from this book.
How much time, students need to do chapter 3 of grade 10th Science?
Students need a maximum of 10-12 days to complete chapter 3 of class 10th Science if they give 1-2 hours per day to this chapter. This time is an approximate time. This time can vary because no students can have the same working speed, efficiency, ability, etc.
Is chapter 3 of 10th Science NCERT easy or tough?
Chapter 3 (Metals and Non-Metals) of class 10th Science is not easy and not tough. It lies in the mid of easy and tough because some part of this chapter is easy, and some part is complex. However, the difficulty level of any topic varies from child to child. So, Chapter 3 (Metals and Non-Metals) of class 10th Science is easy, or tough depends on children also. Some children find it hard, some find it easy, and some find it in the middle of easy and difficult.
What are the main topics of chapter 3 Class 10th Standard Science?
The main topics of chapter 3 (Metals and Non-Metals) of 10th Standard Science are:
- 1. Physical properties of Metals and Non-Metals
- 2. Chemical properties of Metals
- 3. What happens when Metals are burnt in Air?
- 4. What happens when Metals react with Water?
- 5. What happens when Metals react with Acids?
- 6. How do Metals react with Solutions of other Metal Salts?
- 7. The Reactivity Series
- 8. HOW DO METALS AND NON-METALS REA ALS REACT?
- 9. Properties of Ionic Compounds
- 10. OCCURRENCE OF METALS
- 11. Extraction of Metals
- 12. Enrichment of Ores
- 13. Extracting Metals Low in the Activity Series
- 14. Extracting Metals in the Middle of the Activity Series
- 15. Extracting Metals towards the Top of the Activity Series
- 16. Refining of Metals
- 17. Electrolytic Refining
- 18. Corrosion
- 19. Prevention of Corrosion