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# Coal and Petroleum NCERT Solutions - Class 8 Science

## NCERT Solutions for Class 8 Science Chapter 5 - Free PDF Download

Last updated date: 31st Jan 2023
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Learning about fossil fuels, how they are extracted, and how they are being replaced by eco-friendlier energy is very important for young minds. This is why CBSE has introduced a chapter in Class 8 Science book based on coal and petroleum. It is the 5th chapter that talks about the exhaustion of the non-renewable resources we are using every day. Class 8 Science Chapter 5 is a crucial part of the syllabus. You should follow the exercise questions and learn how to answer them by referring to the NCERT solutions for Class 8 Science Chapter 5 by Vedantu.

### Important Topics Covered in Chapter 5 of Class 8 Science NCERT Solutions

The topics and subtopics that are covered in Chapter 5 of NCERT Solutions for Class 8 Science are given as follows:

1. Coal

2. Coal gas

3. Coal tar

4. Coke

5. Fossil fuel

6. Natural gas

7. Petroleum

8. Refining of petroleum

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## Access NCERT Solutions for Class 8 Science Chapter 5 – Coal and Petroleum

1. What are the advantages of using CNG and LPG as fuels?

Ans: The advantages of using compressed natural gas (CNG) and liquified petroleum gas (LPG) as fuels is as follows:

1. They give a lot of heat energy when burnt as compared to other fuels like kerosene, coal, etc

2. They do not emit smoke when burnt, as they are clean fuels.

3. They have low prices.

4. They are easily available.

5. They can be easily transported by cylinders or pipelines.

2. Name the petroleum product used for surfacing of roads.

Ans: Bitumen is the petroleum product used for surfacing roads.

3. Describe how coal is formed from dead vegetation. What is this process called?

Ans: Coal is made up of the remains of dead plants and animals buried in the ground, exposed to high temperatures and pressure in the absence of air. This process of the formation of coal is known as carbonization.

4. Fill in the banks.

a) Fossil fuels are ____ , ____ and _____.

Ans: Fossil fuels are coal, petroleum and natural gas.

b) Process of separation of different constituents from petroleum is called ____.

Ans: Process of separation of different constituents from petroleum is called refining.

c) Least polluting fuel for vehicles is _____.

Ans: Least polluting fuel for vehicles is compressed natural gas (CNG).

4. Tick True/False against the following statements.

a) Fossil fuels can be made in the laboratory.

Ans: False. Fossil fuels are made from the remains of dead plants and animals buried inside the earth millions of years ago and exposed to high temperature and pressure conditions.

b) CNG is more polluting fuel than petrol.

Ans: False. CNG is an eco-friendly fuel and safe to use as it does not cause any health issues. Therefore, it is very less polluting.

c) Coke is almost pure form of carbon.

Ans: True. Coke is a fuel with few impurities and high carbon content. That is why it is an almost pure form of carbon.

d) Coal tar is a mixture of various substances.

Ans: True. Coal tar is a mixture of various substances such as dyes, paints, explosives, drugs, etc.

e) Kerosene is not a fossil fuel.

Ans: False. Kerosene is one of the products of the distillation of petroleum products.

5. Explain why fossil fuels are exhaustible natural resources.

Ans: Mineral oil is made from the dead remains of plants and animals that were buried in the ground millions of years ago under high temperatures and pressure, which cannot be synthesized in the laboratory. Therefore, fossil fuels are a completely natural resource.

6. Describe characteristics and uses of coke.

Ans: Coke is a substance produced by the destructive distillation of coal. It is a grey, hard and porous fuel with high carbon content and few impurities. It is used to make steel and metal extraction as a reducing agent.

7. Explain the process of formation of petroleum.

Ans: Petroleum is made up of dead plant and animal fossils buried in the ground millions of years ago under high temperatures and pressure in the absence of air the dead remains are broken into smaller units to form petroleum and natural gas.

8. The following Table shows the total power shortage in India from $1991-1997$ . Show the data in the form of a graph. Plot shortage percentage for the years on the Y-axis and the year on the X-axis.

 S.No. Year Shortage ($\%$) $1$ $1991$ $7.9$ $2$ $1992$ $7.8$ $3$ $1993$ $8.3$ $4$ $1994$ $7.4$ $5$ $1995$ $7.1$ $6$ $1996$ $9.2$ $7$ $1997$ $11.5$

Ans: Plot the graph from the above data taking shortage percentage on the Y-axis and the year on the X-axis:

For example, for the year $1991$ we mark the point $7.9$ on the Y-axis.

Similarly, plotting the other points we get,

## Coal and Petroleum: NCERT Solutions for Class 8 Chapter 5 Science Summary

The prime pillar of human development is the discovery of natural fuels. Coal and petroleum have been the main source of energy that drives our homes and machines. Without them, we would have stopped everything we use these days and go back to the dark ages. NCERT Class 8 Chapter 5 Science tells us how brilliant the discovery of fossil fuels has catapulted the growth of human civilization towards a better future. As per the Class 8 Science Chapter 5 Coal and Petroleum, these sources are getting exhausted day by day. Scientists have started to harness the inexhaustible energy from natural sources by preparing new machines.

In this Class 8th Science Chapter 5, you will also learn how fossil fuels are formed. Learn how they take millions of years and the right conditions to develop into coal and petroleum. In this chapter, you will also learn how destructive distillation and fractional distillation give us the products we use. Coal and petroleum cannot be used in natural conditions. They are chemically and physically treated to produce the fuels and products fit for usage. Study the NCERT Class 8 Science Chapter 5 properly and learn the new concepts in such a way that you can answer the questions in the exercises.

To help you in this section, the teachers of Vedantu have prepared NCERT Solutions for Class 8 Science Chapter 5. You can refer to the answers scribed by the teachers experienced in teaching Class 8 Science. These teachers are aware of the problems generally faced by the students while studying this chapter. All the answers are formulated following the CBSE guidelines.

## NCERT Solutions of Class 8 Science Chapter Wise Marks Weightage

The Coal and petroleum Chapter will have good weightage in the examination and is an important chapter from the exam point of view. The topic of fossil fuels has the highest weightage in this topic. The topic explained in this will help you obtain more marks and will let you understand the concept very well. There is a high scope of getting 5 marks questions. The 3 marks and 2 marks questions from this topic are equally important. The 2 marks questions are important ones and there are few frequently asked questions listed below which will help you understand the type of questions asked in the exam.

## Why Should You Use NCERT Solutions for Class 8 Science Coal and Petroleum?

The prime reasons for using NCERT Solutions for Class 8 Science Coal and Petroleum are mentioned below.

### Appropriate Answers for Chapter 5 Class 8 Science

It becomes a lot easier to find the answers to the exercise questions from the Class 8 Science Ch 5 solution. The solution has been formatted following the exercise. Hence, students of Class 8 will find out the answers to a particular question without any delay. All these answers are appropriate and can be used during the exams to score better.

### Simplified Explanations of the Answers

Students might need an explanation of the answers to the questions in the exercise. It can be achieved by following the answers provided in Chapter 5 Science Class 8 NCERT Solutions. All the questions are explained and the answers are simplified so that students can also make their own.

### Proper Preparation of Chapter 5 Science Class 8

If you have an exam, use the NCERT solution of Class 8 Science Chapter 5 and revise the chapter easily. You can also find the shortest way to answer the exercise questions to prepare.

### Following CBSE Format

When you use the NCERT solutions for Class 8 Science Ch 5, you will automatically learn the CBSE format to answer questions and score better in the exams.

Download the NCERT solutions Class 8 Science Chapter 5 for free and access it to prepare the chapter offline. There is no need to delay as you can clear your doubts by referring to the NCERT Solutions for Class 8 Science Chapter 5 Coal and Petroleum.

### Chapter wise NCERT Solutions for Class 8 Science

Along with this, students can also view additional study materials provided by Vedantu, for Class 8:

### Important Points Discussed in Chapter 5 of Class 8 Science NCERT Solutions

• The resources which will never be exhausted by human activities are called Inexhaustible natural resources whereas the resources which will be exhausted by human activities and are limited in nature are called exhaustible natural resources.

• Coal is a hard substance which is black in colour. It is used as fuel in household and industrial activities.

• Coke is the extracted substance of coal. While extracting coke from the coal, coal gas is produced.

• Petroleum is also a natural resource which is exhaustible in nature. Petroleum is the mixture of petrol, diesel, petroleum gas, lubricating oil, etc. Various petroleum products are used in many household and commercial fields.

• The following are some of the benefits of using CNG and LPG as fuels:

1. Both CNG and LPG are easily ignited.

2. When CNG and LPG are burned, a lot of heat energy is released.

3. CNG and LPG are easily transported.

4. When burned, CNG and LPG are non-toxic fuels that do not emit smoke.

## FAQs on Coal and Petroleum NCERT Solutions - Class 8 Science

1. What is the Best Way to Prepare CBSE Class 8 Science Chapter 5 Coal and Petroleum?

The best way to prepare the chapter is to follow the classroom sessions, study the chapter well, and solve the exercise questions. Refer to the Class 8 Science Chapter 5 Solutions to find answers quickly and compare them with yours. You can also revise the chapter by using the NCERT solution for Class 8 Science Chapter 5 and save time before an exam.

2. Why Coal and Petroleum are Important for us?

The entire world needs the energy to run its machines and factories. As per the Science Chapter 5 Class 8, coal and petroleum are the prime sources of energy we use.

3. Why Should You Prefer Vedantu for NCERT Solution Class 8 Science Chapter 5?

Vedantu provides quality NCERT Solutions of Class 8 Science Chapter 5 that match all your requirements to prepare the chapter.

4. What are Petroleum and Coal?

Both petroleum and coal are types of fossil fuels. Coal is black and is hard as a stone. In old times it was used as a burning agent for cooking food and for the production of steam for engines and trains. Coke, coal tar, and coal gas are products obtained from coal. Petroleum is a dark-coloured oily liquid that contains a foul smell. Petroleum gas, petrol, diesel, lubricating oil are a few of its constituents.

5. What are the advantages of using CNG and LPG as fuels?

The full form of CNG is ‘Compressed Natural Gas’. The full form of LPG is ‘Liquified petroleum gas’. A few of the advantages of using CNG and LPG as fuels are listed below;

• CNG and LPG do not cause pollution. At the time of burning, they release a smokeless flame as they are clean fuels.

• No ashes are left behind while burning.

• The handling process is quite easy.

• For storing purposes, they are convenient.

6. What are Fossil Fuels according to the NCERT Solutions?

According to NCERT Solutions, when the remaining matter of plants and animals decays and remains buried for millions of years under the Earth’s surface inside the soil, this leads to the formation of fossil fuels. They are an exhaustible natural resource, which means that they are limited in nature. They can be exhausted sooner due to human activities. Coal, petroleum, and natural gas are the types of fossil fuels.

7. Write the summary of NCERT Class 8 Science Chapter 5.

Class 8 Science Chapter 5 consists of many concepts and definitions like the formation of coal, short descriptions of natural resources, fossil fuels, types of energies, different types of coal found, fractional distillation, oil extraction, natural gas, and more. This is just a glimpse of Chapter 5. There is still much left for you to study. You can get the detailed study material on Vedantu’s website. The solutions are prepared by experts and are available free of cost. You can also download them from Vedantu’s app, which is available at the Google Playstore.

8. List some key concepts in NCERT Class 8 Science Chapter 5.

There are a bulk of different concepts or topics in this chapter, but some of the key concepts in NCERT Class 8 Science Chapter 5 are given below -

• Definition of CNG and its advantages

• What do you mean by Vaporisation?

• Crude oil

• Short note on energy and its types

• Types of natural resources

• Main constituents of petroleum

• Carbonisation

• Describe petroleum refining.