NCERT Solutions for Class 8 Science Chapter 3 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.

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,

Topics Covered In Class 8 Science Chapter 3 Coal and Petroleum

Benefits of NCERT Solutions For Chapter 3 Science Class 8 Coal and Petroleum

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

• Finding the answers to the exercise questions from the Class 8 science ch 3 becomes a lot easier. The solution has been formatted following the exercise.

• Students might need an explanation of the answers to the questions in the exercise. It can be achieved by following the answers in class 8 science chapter 3 coal and petroleum question answers.

• If you have an exam, use the NCERT solution of class 8 chapter 3 science and revise the chapter easily. You can also find the shortest way to answer the exercise questions to prepare.

• When you use the coal and petroleum class 8 questions and answers, you will automatically learn the CBSE format to answer questions and score better in the exams.

• Download the NCERT Solutions Coal and Petroleum Class 8 PDF for free and access it to prepare the chapter offline. 

• NCERT Science chapter 3, science class 8 tells us how brilliant the discovery of fossil fuels has catapulted the growth of human civilisation toward a better future. 

Conclusion 

NCERT Solutions for Science Class 8 Chapter 3 question answers are invaluable resources that deepen students' understanding of these essential natural resources. The chapter explores the origin, formation, and extraction of coal and petroleum, shedding light on their significance in the energy sector. The answers to the questions in class 8 Science Chapter 3 provide comprehensive explanations, ensuring that students grasp the scientific principles behind these fossil fuels. 

Important Study Material Links for Class 8 Science Chapter 3

NCERT Solutions for Class 8 Science - Chapter-wise List

The chapter-wise NCERT Solutions for Class 8 Science are given below. These solutions are provided by the science experts at Vedantu in detail. Go through these chapter-wise solutions for all other chapters to be thoroughly familiar with the concepts.

Important Related Links for CBSE Class 8 Hindi