NCERT solutions for class 10 science chapter 3 Metals and Non-metals: Through this chapter, you will get to know about elements those can be classified as metals and non-metals. The NCERT solutions for class 10 science chapter 3 Metals and Non-metals are created by the experts which will help you to clear your concepts and doubts related to the chapter. Learning the fundamentals in science subject is very important, so, with the help of solutions for CBSE class 10 science, this becomes easy. You can easily score well by practicing the questions with the help of NCERT solutions for class 10 science chapter 3 Metals and Non-Metals. The NCERT solutions provide answers to all the exercises questions and as well as to the questions mentioned in between the chapter.
The solutions provided in this article are based on the CBSE syllabus for class 10 science. Along with board exams, these NCERT solutions for class 10 will help you to crack competitive exams such as JEE, NEET, KVPY, NTSE, etc. and it will also help you to complete your homework and assignments. Before getting into the details of CBSE NCERT solutions for class 10 science chapter 3 Metals and Non-Metals, let's check what you will get to know in the chapter 3 Metals and Non-Metals:
Things you will get to know through NCERT solutions for class 10 science chapter 3 Metals and Non-Metals:
- Metals are shiny, easily pliable, ductile and are good conductors of heat and electricity.
- Metals are solids at room temperature, except mercury which is a liquid. By losing electrons to non-metals, they can form positive ions.
- Metals combine with oxygen to form basic oxides. Aluminum oxide and zinc oxide show the properties of both basic as well as acidic oxides. These oxides are known as amphoteric oxides. Different metals have different reactivities with water and dilute acids.
- You will study that a list of common metals arranged in order of their decreasing reactivity is known as an activity series.
- Non-metals have properties opposite to that of metals. Non-metals are neither malleable nor ductile.
- Except for graphite which conducts electricity, other non- metals are bad conductors of heat and electricity.
- When reacting with metals, non-metals form negatively charged ions by gaining electrons. They form oxides that are either acidic or neutral.
- They do not displace hydrogen from dilute acids. They react with hydrogen to form hydrides.
NCERT solutions for class 10 science chapter 3 Metals and Non-Metals - solutions
Q.2. Explain the meanings of malleable and ductile.
Malleable substances are the substance which can be beaten in order to convert them into sheets. Generally, all metals are considered to be malleable in nature.
For example silver, iron, etc. Gold has the highest malleable property as one single gram of gold can be beaten into a sheet of 1 square meter.
Ductile substances are substances which can be drawn into wires. All the metals like gold, copper are dectile in nature. Moreover, the wires for transfer of electricity are made of copper.
NCERT free solutions for class 10 science chapter 3 Metals and Non- Metals
Topic 3.2: Chemical properties of metals
Q.1. Why is sodium kept immersed in kerosene oil?
Sodium is a very reactive metal. It reacts rapidly with the oxygen and thus cannot be kept in air as it will explode. So it is better to store in a liquid.
Further the density of sodium is less than that of water so it will float on the surface. So water is not a good solvent for the purpose. So sodium is kept in kerosene oil.
Iron reacts with steam and forms iron oxide. The reaction is shown below :
Q.3. (iii) Samples of four metals A, B, C, and D were taken and added to the following solution one by one. The results obtained have been tabulated as follows.
Use the table above to answer the following question about metals A, B, C, and D.
(iii) Arrange the metals A, B, C, and D in the order of decreasing reactivity.
||Iron (II) sulphate
||Copper (II) sulphate
As stated in part (a):-
No metal is able to displace zinc from its solution thus zinc is most rection among given metals.
Further, only metal B is able to displace iron from iron sulphate solution. And element A can displace copper. Similarly, element C can displace silver from its solution.
So the reactivity order obtained is : D < C < A < B
Q.4.Which gas is produced when dilute hydrochloric acid is added to a reactive metal? Write the chemical reaction when iron reacts with dilute.
In the case when dilute hydrochloric acid is added to a reactive metal we obtain hydrogen gas. The reaction when suphuric acid reacts a reactive metal is shown below :
In this reaction, we obtain iron suphate solution with release of hydrogen gas.
The formation of Na2O and MgO is shown below:-
Q.2. Why do ionic compounds have high melting points?
The ionic compounds have a very strong electrostatic force of attraction. To overcome these force very high energy is needed. Thus it is generally seen that the melting point of ionic compounds is quite high.
CBSE NCERT solutions for class 10 science chapter 2 Metals and Non- Metals
Topic-3.4: Occurrence of metals
Q.1. (i) Define the following terms - Mineral.
In nature, the elements are present in a combined state known as minerals. Minerals may be defined as the solid chemical compound that occurs naturally in pure form. The chemical composition of minerals is said to the same throughout.
Q.1. (ii) Define the following terms- Ore.
Ores are defined as the minerals which can be extracted to make profits. Only economically extractable elements (generally metals) are considered to be ores.
Gangue is the impurities present in the ores such as sand, silt soil. To make the element efficient and more useful, we need to remove the gangue from the ores.
The metals which are very low reactive elements may be found in free states. Two such metals are gold and silver. These metals are so unreactive that they don't form any oxides, peroxides or sulphides.
Q.3. What chemical process is used for obtaining a metal from its oxide?
We can obtain metal from its oxide by using the reduction process. The metal oxides are reduced using reducing agents such as highly reactive metals so that they can displace the metal from its oxide.
For e.g. From zinc oxide, we can get zinc by using reducing agent carbon.
The low reactive metals such as gold don't corrode easily whereas highly reactive elements are very easily corroded.This is why these metals (highly reactive) are given gold plating in order to protect them from corrosion.
Q.3. What are alloys?
Alloys are defined as the homogeneous mixture of two or more than two elements. Alloys are prepared to give specific features of all the constituent elements. It is prepared by melting one metal and then diffusing other into.
For example: steel is an alloy of iron and carbon.
Q.12.(a) Give reasons:
Platinum, gold, and silver are used to make jewellery.
There are three main reasons for why platinum, gold, and silver are used to make jewellery :-
(i) They are lustrous in nature.
(ii) They are very low reactive elements, thus they don't corrode easily.
(iii) They are found in low quantity so that makes them costly and not available for all. Hence these are used as a sign to show status in society.
Q.14. Differentiate between metal and non-metal on the basis of their chemical properties.
The major differences between metals and non-metals are given below:-
|1. They have ionic bonds.
|| They have covalent bonds
|2. They are electropositive.
|| They are electronegative.
|3. They form basic oxides.
|| They form acidic oxides.
|4. They react with dilute acids to form salt and evolve hydrogen gas.
|| Since they cannot replace hydrogen thus they cannot react with dilute acids.
This is because steel contains iron which reacts with steam and forms iron oxide. Whereas copper doesn't react with cold water, hot water and steam.
That's why hot water tanks are made up of copper, not steel.
NCERT Solutions for Class 10 Science - Chapter wise
Benefits NCERT solutions for class 10 science chapter 3 Metals and Non-Metals
- The solutions provided in this article, are easy to understand.
- NCERT solutions provided here for chapter 3 metals and non-metals can help you to score well in the CBSE board exam for class 10 science.
- You can also find exercise questions and intext questions in the same place.
- Step-wise step solutions are provided by the experts if you have any doubt you can ask them directly.