NCERT Solutions for Class 10 Science Chapter 3 Metals and Non-metals

Q:

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

A:

Non-metals combine with oxygen to form acidic oxides or neutral oxides. Examples of acidic oxides are SO2, CO2 etc. and examples of neutral oxides are NO, CO etc.

Q:

What are amphoteric oxides? Give two examples of amphoteric oxides.

A:

Amphoteric oxides are the oxides, which react with both acids and bases to form salt and water. Examples: Zinc oxide (ZnO) and Aluminium oxide (Al2O3)

Q:

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.

A:

(c) Zinc is more reactive than tin which may react with food items and make it unfit for health.

Q:

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.

A:

(a) Calcium

Q:

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.

A:

(c) Applying a coating of zinc

Q:

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.

A:

(d) AgNO3 solution and copper metal

Q:

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?

A:

The solution he had used was Aqua regia which is the mixture of concentrated hydrochloric acid and concentrated nitric acid in the ratio of 3:1. It is a fuming, highly corrosive liquid that is capable of dissolving metals like Gold and Platinum. Since the outer layer of the gold bangles is dissolved in aqua regia so their weight was reduced drastically.

Q:

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.

A:

Copper reacts with moist carbon dioxide in air to form copper carbonate and as a result, copper vessel loses its shiny brown surface forming a green layer of copper carbonate. The sour substances like lemon or tamarind contain citric acid that neutralises the basis copper carbonate and dissolves the layer. That is why; tarnished copper vessels are cleaned with lemon or tamarind juice to give the surface of the copper vessel its characteristic lustre.

Q:

State two ways to prevent the rusting of iron.

A:

The two ways by which rusting of iron can be prevented are:

1. By oiling, greasing or painting the surface becomes waterproof and the moisture and oxygen present in the air cannot come into direct contact with iron. Hence, rusting is prevented.
2. By Galvanization: In this method an iron article is coated with a layer of zinc metal, which prevents the iron from coming in contact with oxygen and moisture. Hence, rusting is prevented.

Q:

Name two metals which will displace hydrogen from dilute acids, and two metals which will not.

A:

Metals that are more reactive than hydrogen displace it from dilute acids. For example, sodium and potassium displace hydrogen from dilute acids. On the other hand less reactive metals like copper, silver do not displace hydrogen from dilute acids.

Q:

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

A:

Q:

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:

1. Platinum, gold, and silver are used to make jewellery because they are very less reactive metals. Also they are lustrous and do not corrode easily.
2. Sodium, potassium, and lithium are very reactive metals. They react 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.
3. Aluminium is a highly reactive metal and 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.
4. 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 their carbonates and sulphides.

Q:

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:

Q:

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

A:

In the electrolytic refining of a metal M:
Anode is impure, thick block of metal M
Cathode is thin strip or wire of pure metal M
Electrolyte is salt solution of metal M to be refined

Q:

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.

A:

1. If a substance can be beaten into thin sheets with the help of a hammer then it is a metal, whereas if it gets broken into pieces then it is non-metal. We can use the battery, bulb, wires, and a switch to set up a circuit with the sample. If the sample conducts electricity and bulbs starts to glow, then it is a metal otherwise it is a non-metal.


2. When a substance fulfills both the criteria then it can be confirmed as a metal. We know that there are some exceptions also for example sodium is metal which is not malleable in fact it is brittle. Graphite, a non-metal (allotrope of carbon) is a good conductor of electricity. Hence, either of the tests cannot confirm a metal or non-metal; when the test is done in isolation.

Q:

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

A:

Benefits of NCERT Solutions

NCERT Solutions for Class 10 contain immensely significant points and for every chapter, each concept is simplified so that it turns out to be easy to remember that expands the odds of scoring commendably in the board exams. NCERT Solutions for class 10 by Extramarks is the best reference material for test preparation. Given below are a couple of points about how these solutions help in exam preparation.
1. It helps students practice loads of questions from every chapter which encourages them to make their concepts more grounded..

2. NCERT Solutions for Class 10 encourages you to upgrade your knowledge and clear your concepts with the goal that you can score well in your exams.

3. These solutions are the best examination materials to know your weak and strong points. It is essential to work on your weak points to score well in the exams. 

4. Most of the questions in exams are asked in a similar arrangement from NCERT textbooks. Hence, students should altogether revise every chapter’s solution to get a good command in subjects

Tips & Strategies for Class 10 Exam Preparation

1. Make a timetable to complete your syllabus and make time for revision.

2. Refer to NCERT Solutions given on the Extramarks website to clear your concepts anytime while preparing for your exams.

3. Start studying with the help of Extramarks – The Learning App to pass your exams with flying colours. It provides complete study material with solved and unsolved papers.

4. It is important to clear all your doubts before the exam with your teachers or Alex (an AI studybot).

5. While reading or learning a chapter, make sure to make notes with algorithms, formulas, theorems, etc., and study them for a quick revision before exams.

6. Practice an ample number of question papers to make your concepts stronger.

7. Take rest and a proper meal. Don’t stress too much.

Why opt for Extramarks NCERT Solutions for Class 10 ?

Extramarks provide NCERT Solutions for all subjects at your fingertips. These solutions are designed by subject matter experts and provide solutions to every NCERT textbook questions. Extramarks especially focuses on making learning interactive, effective and for all classes. We provide free NCERT Solutions for class 10 and all other classes

Frequently Asked Questions

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How to use NCERT Solutions for scoring in class 10 Maths CBSE Board Exams?

NCERT 10 solutions for math are in-depth solutions written in very basic and simple language which makes them easy to understand. It gives sufficient study material to practice with to the students which the latter can use for practicing for board exams. Extramarks website has NCERT solutions for all classes that can be used by students of different classes. These solutions can be accessed by visiting the footer section of the website. Prepare notes and learn from NCERT solutions, go through them thoroughly before the exam, and practice with the questions that crop up in NCERT solutions.

Do you provide solutions for All subjects for class 10 CBSE?

Yes, Extramarks website has NCERT solutions for class 10 along with all other classes of CBSE listed on the footer section. These solutions have been prepared by top faculty members who have years of experience and expertise in teaching CBSE students.

Why are the NCERT solutions Important for Class 10?

 Extramarks class 10 NCERT solutions are crucial for board preparation for students. These solutions are given in a simple language which makes it easy to understand for all and it proves to be the basis for board examination which further helps the students in understanding the extensive study material. Class 10 NCERT solutions focus on fundamental clarity of the concepts which further helping in clearing all doubts and helping students achieve concept clarity. NCERT solutions provide enough practice and study material to students that they can use to test their knowledge

Will NCERT solutions of Class 10th be good enough to prepare for the Class 10 Board exams?

Yes, class 10 solutions (NCERT) are sufficient to prepare for class 10 board exams. NCERT solutions are simple and easy to understand written in a way that is appealing to students. NCERT solutions form the basis of examination of class 10 board so they prove to be a sufficient solution which also gives enough study material to practice with to students. Different types of NCERT solutions help students prepare for the exam through varied formats and provide them concept clarity.

Do I need to use textbook solutions other than NCERT solutions for Class 10 exam prep

Class 10 CBSE NCERT solutions are sufficient to prepare for board exams but if you want to test your knowledge and would like to browse more solutions then you can use textbook solutions to prepare for the exam. Although the NCERT solutions are enough for preparing for the exam, you can check out the solved and unsolved sample papers along with textbook solutions from Extramarks - The Learning App and website

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