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

Metal and Non Metals Class 10 Questions and Answers (Topic-wise)

Topic 3.1 - Physical Properties

Q.1. (i) Give an example of a metal which is a liquid at room temperature.

Answer:

Generally, metals are solid at room temperature as they have a strong metallic bond that binds them close.

But mercury is a metal which exists as a liquid metal at room temperature.

Q.1. (ii) Give an example of a metal which can be easily cut with a knife .

Answer:

Metal is generally hard in nature due to its metallic bond between each other. But sodium is a metal which is so soft that it can even be cut with a knife.

Q.1. (iii) Give an example of a metal which is the best conductor of heat.

Answer:

Most of the metals are a good conductor of heat and electricity but silver is considered the best conductor of heat and electricity among them (gold and copper are also very good conductors).

Q.1. (iv) Give an example of a metal which is a poor conductor of heat.

Answer:

Generally, metals are considered a good conductor of heat and electricity. But mercury and lead show slight exception as they are a poor conductors of heat.

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?

Answer:

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.

Q.2. (i) Write equations for the reactions of iron with steam

Answer:

Iron reacts with steam and forms iron oxide. The reaction is shown below :

Q.2. (ii) Write equations for the reactions of calcium and potassium with water

Answer:

Calcium and potassium react with water to give their respective hydroxides. The reactions are shown below :

Q.3. (i) 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.

(i) Which is the most reactive metal?

Answer: From the table, it can be seen that 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

Hence B is most reactive.

Q.3. (ii) 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 questions about metals A, B, C and D.

(ii) What would you observe if B is added to a solution of Copper(II) sulphate?

Answer:

As we have seen part (a) that element A can displace copper from its solution. Also, B is more reactive than element A.

So element B will also displace copper from copper sulphate solution.

Question:

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 .

Answer:

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 .

Answer:

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.

Q.5. What would you observe when zinc is added to a solution of iron(II) sulphate? Write the chemical reaction that takes place.

Answer:

By reactivity, we know that zinc is more reactive than iron. Thus zinc will displace iron from the iron sulphate solution and form zinc sulphate. The reaction is shown below:-

NCERT solutions for Class 10 Chapter 3 Science

Topic- 3.3: How do metals and non-metals react?

Q.1. (i) Write the electron-dot structures for sodium, oxygen, and magnesium.

Answer:

The electron dot structure for sodium, oxygen, and magnesium is shown below:-

Q.1. (ii) Show the formation of and by the transfer of electrons.

Answer:

The formation of Na ₂ O and MgO is shown below:-

Q.1. (iii) What are the ions present in and compounds?

Answer:

In the ions present are Na ⁺ and O ^2- , whereas in the ions are Mg ²⁺ and O ^2- .

Q.2. Why do ionic compounds have high melting points?

Answer:

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 .

Answer:

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 .

Answer:

Ores are defined as the minerals which can be extracted to make profits. Only economically extractable elements (generally metals) are considered to be ores.

Q.1. (iii) Define the following term- Gangue.

Answer:

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.

Q.2. Name two metals which are found in nature in the free state .

Answer:

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?

Answer:

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.

NCERT Solutions for Class 10 Science Ch 3:

Topic 3.5 Corrosion

Q.1. Metallic oxides of zinc, magnesium, and copper were heated with the following metals

In which cases will you find displacement reactions taking place?

Answer:

The reactivity order of the given elements are: Mg > Zn > Cu

Thus the following result is observed :

Q.2. Which metals do not corrode easily?

Answer:

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?

Answer:

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.

NCERT solutions for class 10 science chapter 3 Metals and Non-Metals Exercise Solutions:

Q.1. Which of the following pairs will give displacement reactions?

a) NaCl solution and copper metal

b) solution and aluminum metal

c) solution and silver metal

d) solution and copper metal

Answer:

solution and copper metal.

In all other options, the solution metal is more reactive than the given metal.

For e.g . in solution and aluminum metal, Mg metal is more reactive than aluminum thus reactive will not take place.

Q.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.

Answer:

(c) Applying a coating of zinc

It will be most suitable method to prevent it. Paint and grease can also be applied but these are not suitable methods as the pan will be heated and washed again and again.

Q.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.

Answer:

The element is Calcium. As calcium oxide is soluble in water and has a high melting point.

Q.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.

Answer:

This is because zinc is more reactive than tin. So zinc may react with food items and make food unhealthy to consume.

Q.5. (a) You are given a hammer, a battery, a bulb, wires, and a switch.

How could you use them to distinguish between samples of metals and non-metals?

Answer:

To distinguish between metals and non-metals we can use two properties of metals:-

(i) Most of the metals are malleable i.e., they can be converted into sheets. So with the help of a hammer, we can test and distinguish.

(ii) Metals are a good conductor of electricity whereas non-metals are poor conductors.

Q.5. (b) You are given a hammer, a battery, a bulb, wires, and a switch.

Assess the usefulness of these tests in distinguishing between metals and non-metals.

Answer:

These are useful as there is no chemical reaction involved in identifying the metals and non-metals. These are just the physical test which can be carried out at any level. As in the first test, the hammer is easily available at home. And in the second test, we have use wires which are easily available in the market.

Class 10 Metal and Non Metal Question Answer

Q.6. What are amphoteric oxides? Give two examples of amphoteric oxides.

Answer:

Amphoteric oxides are those oxides of metals that behave in both acidic and basic manner. These oxides react with acids and bases to produce salt and water as the major products. E.g. Aluminium oxide (Al ₂ O ₃ ), Zinc oxide (ZnO).

Q.7. Name two metals which will displace hydrogen from dilute acids, and two metals which will not .

Answer:

Clearly, the metals which are more reactive than hydrogen will displace it from the dilute acids.

For e.g. potassium and sodium. But metals like silver and gold are less reactive than hydrogen so they will not be able to displace hydrogen.

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

Answer:

The configuration for electrolytic refining will be:-

Electrolyte:- Salt solution of metal M

Anode:- Impure metal M

Cathode:- Pure metal M (Thin strips)

Q9.(a) 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 the figure below.

What will be the action of gas on dry litmus paper?

Answer:

In the given procedure sulphur dioxide is formed.

(i) Thus gas (sulphur dioxide) has no effect on dry litmus paper.

(ii) SO ₂ converts moist blue litmus paper to red due to the formation of sulphurous acid. (as sulphur dioxide reacts with moisture to produce acid).

Q.9.(b) 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 the figure below.

Write a balanced chemical equation for the reaction taking place.

Answer:

In the reaction, sulphur dioxide is formed. The chemical reaction is shown below:-

Q10. State two ways to prevent the rusting of iron.

Answer:

The two ways to prevent rusting of iron is:-

(a) By making alloys of the elements.

(b) By using the electroplating method such as galvanization.

Q.11. What type of oxides are formed when non-metals combine with oxygen?

Answer:

When non-metals combine with the oxygen they form acidic oxides.

For e.g. SO ₂ is an acidic oxide formed when sulphur combines with oxygen.

Q.12.(a) Give reasons:

Platinum, gold, and silver are used to make jewellery.

Answer:

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.12. (b) Give reasons:

Sodium, potassium, and lithium are stored under oil.

Answer:

The elements like sodium, potassium, and lithium are very reactive metals. They react with oxygen vigorously and thus are dangerous to keep them in contact with air and moisture. Hence they are generally kept under oil.

Q.12. (c) Give reasons:

Aluminum is a highly reactive metal, yet it is used to make utensils for cooking.

Answer:

This is true that aluminum is a highly reactive element but it has a property of non-corrosion. That's why it is used to make cooking utensils. The property comes from the fact that aluminum reacts with oxygen and forms a thin layer of aluminum oxide which acts as a protective coating layer to resist further corrosion.

Q.12. (d) Give reasons:

Carbonate and sulphide ores are usually converted into oxides during the process of extraction.

Answer:

This is because the extraction of metal is easier from their oxides rather than their carbonates or sulphides. As in case of oxides we have to simply use a metal more reactive than the impure metal which needs to be extracted.

Q.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.

Answer:

The lemon and tamarind contains citric acid which neutralizes the basic carbon carbonate and thus dissolves the greenish layer. This is why lemon juice and tamarind is used to clean tarnished copper vessels.

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

Answer:

The major differences between metals and non-metals are given below:-

Q.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?

Answer:

The solution man used must be aqua regia. It is a solution of a 3:1 mixture of conc. HCl and conc. HNO ₃ . It has the property that gold dissolves in this solution.

After dipping the gold in the solution, the outer layer of gold dissolves and the new surface is exposed which appears to be shiny. This is why the weigth of ornament is decreased.

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

Answer:

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.

The NCERT textbook for Class 10 Science, which is required in CBSE schools in India, is the source of Chapter 3 Metals and Non Metals. These CBSE Class 10 Science Chapter 3 question answer will assist you not only in preparing for your Class 10 exam but also in passing other competitive exams. For more information on Class 10th Science Chapter 3 question answer, continue reading.

Chapter 3 Science Class 10: Important Formulas and Diagrams + eBook link

Chapter 3: Metals and Non-metals

Important Reactions

Metal + Oxygen → Metal oxide

For example: 2Cu (Copper) + O2 → 2CuO (Copper(II) oxide)

Aluminium oxide reacts in the following manner with acids and bases:

Al2O3 + 6HCl → 2AlCl3 + 3H2O

Al2O3 + 2NaOH → 2NaAlO2 (Sodium aluminate) + H2O

Sodium oxide and potassium oxide dissolve in water to produce alkalis as follows:

Na2O(s) + H2O(l) → 2NaOH(aq)

K2O(s) + H2O(l) → 2KOH(aq)

Metal + Water → Metal oxide + Hydrogen

Example: 2Al(s) + 3H2O(g) → Al 2O3(s) + 3H2(g)

Metal oxide + Water → Metal hydroxide

Example: 2K(s) + 2H2O(l) → 2KOH(aq) + H2(g) + heat energy

Metal + Dilute acid → Salt + Hydrogen

Metal A + Salt solution of B → Salt solution of A + Metal B

Reactivity series

For more, Download Ebook - NCERT Class 10 Science: Chapterwise Important Formulas, Diagrams, And Points

Metals and nonmetals Class 10 - Important Topics of NCERT Textbook

Chapter 3 Chemistry class 10: Let us take a look at the topics and subtopics covered by the NCERT solutions for Class 10 Science Chapter 3 Notes for Metals and Non-Metals before diving into the NCERT Solutions for Class 10 Science Chapter 3 answers.

-Physical Properties of Metals And Non-Metals

-Chemical Properties Of Metals

• What happens when metals are burnt in air?
• What happens when metals react with water?
• What happens when metals react with acids?
• How do metals react with solutions of other Metal Salts
• The Reactivity Series

-How do Metals and Non-Metals react?

• Properties of Ionic Compounds

-Occurrence of metals

• Extraction of metals
• Enrichment of Ores
• Extracting Metals Low in the Activity Series
• Extracting Metals in the Middle of the activities Series
• Extracting Metals towards the top of the Activity Series
• Refining of Metals

-Corrosion

• Prevention of Corrosion

Free download NCERT Solutions for Class 10 Science Chapter 3 Metals and Non-Metals PDF for CBSE exam.

NCERT Solutions for Class 10th Science - Chapterwise

Things you will get to know through NCERT Class 10 Science Solutions chapter 3 Metals and Non-Metals:

• Using NCERT exemplar class 10 Maths chapter 3 solutions, students will know that the metals are shiny, easily pliable, ductile and are good conductors of heat and electricity.
• Through Class 10 Science Chapter 3 question answer, you will get to know that Metals are solids at room temperature, except mercury which is a liquid. By losing electrons to non-metals, they can form positive ions.
• Ch 3 Science Class 10: 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.
• Through NCERT solutions for class 10 science chapter 3 Metals and Non-Metals, students 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.
• In Metals and Non metals Class 10 Solutions, student will study about conduction of heat and electricity. 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.

Highlights of NCERT Solutions for Class 10 Science Chapter 3 – Metals and Non-Metals

The highlight for the Class 10 Science Chapter 3 Solution PDF are given below:

• The NCERT (CBSE) Syllabus and Books are strictly followed in the class 10 science chapter 3 solutions.
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• All the exercise questions and in-text solved questions are available for science chapter 3 class 10.

Benefits of NCERT solutions for class 10 science chapter 3 Metals and Non-Metals:

The key benefits of Metals and nonmetals Class 10 solution PDF are listed below:

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