NCERT Solutions for Class 8 Science Chapter 5 Coal and Petroleum

NCERT Solutions for Class 8 Chapter 5 Coal and Petroleum is prepared for the benefit of Class 8 students. They cover the CBSE syllabus (2020-21) and comprise answers to the questions in the Class 8 Science Chapter 5. This solution guides you in your exam preparation and to understand the topic thoroughly.

Class 8 is one of the important phases of a student’s life. Students learn many new topics in Class 8, which are the basis for the topics included in higher classes. To score good marks in the examinations, students should solve the NCERT questions Class 8 Science provided at the end of each chapter.

These NCERT Solutions for Class 8 Science Chapter 5 has answers to the questions on coal, petroleum and natural gas and other fossil fuels, the formation of fossil fuels, types of fossil fuels, uses of fossil fuels and limitations of using fossil fuels.

These NCERT Solutions are prepared systematically by experienced teachers which will not only help you in your exam preparation but also help you in understanding the topic in-depth.

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Exercise Questions

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

Soln:

The advantages of using CNG and LPG as fuels are as follows

• CNG and LPG burn easily.
• CNG and LPG give a lot of heat energy when burnt.
• CNG and LPG can be transported easily through pipelines.
• CNG and LPG are clean fuels and they do not release smoke when burnt.

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

Soln:

Bitumen is used for surfacing of roads.

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

Soln:

Dense forests got buried under the soil due to natural processes, millions of years ago. More and more soil got deposited over them and they got compressed more. This led them to get exposed to very high temperature and pressure. They slowly got converted into coal under these extreme conditions. The whole process of formation of coal from dead vegetation is known as carbonization.

 4. Fill in the blanks.

(a) Fossil fuels are  ____________,  ____________, and ____________ .

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

(c) Least polluting fuel for a vehicle is ______________ .

Soln:

(a) Fossil fuels Coal, Petroleum, and natural gas.

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

(c) Least polluting fuel for a vehicle is Compressed Natural Gas (CNG).

5. Tick True/False against the following statements.

(a) Fossil fuels can be made in the laboratory. (T/F)

(b) CNG is more polluting fuel than petrol. (T/F)

(c) Coke is the almost pure form of carbon. (T/F)

(d) Coal tar is a mixture of various substances. (T/F)

(e) Kerosene is not a fossil fuel. (T/F)

Soln:

a) False

b) False

c) True

d) True

e) False

6. Explain why fossil fuels are exhaustible natural resources.

Soln:

The process of formation of fossil fuels requires millions of years. Dead vegetation and animals that get buried deep inside the earth require high temperature and pressure for the formation of fossil fuels, which cannot be done in the laboratory. Thus, fossils are limited. Therefore, the use of fossil fuels at a rapid rate will lead to their exhaustion.

7. Describe the characteristics and uses of coke.

Soln:

Characteristics:

i) Coke is tough.

ii) Coke is porous.

iii) Coke is black in colour.

Uses:

i) In the manufacture of steel.

ii) In the extraction of metals (as a reducing agent).

8. Explain the process of the formation of petroleum.

Soln:

Dead organisms that got buried in the sea millions of years ago got covered with layers of sand and clay. Due to lack of air, high temperature and high pressure, these dead organisms got transformed into petroleum and natural gas.

9. The following table shows the total power shortage in India from 1993–1999. 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.

Soln:

Class 8 Science NCERT Solutions for Chapter 5 Coal and Petroleum

Solving the NCERT questions will help you to understand the chapter in a better way. Sometimes NCERT questions are directly asked in the school examinations. NCERT Solutions ensure that the students learn the topic and clear their doubts.

NCERT books are outlined in such a way that every student is capable of understanding the concepts. These textbooks are written and reviewed by the experts before publishing it. There are a few segments at the end of each chapter termed as – Keywords, what have you learned, exercises, extended learning, projects and activities. These projects and activities help students enhance their learning capability.

4 sub-units of Class 8 Chapter 5 Coal and Petroleum

• Coal – Story of coal – coke – coal tar – coal gas
• Petroleum – refining of petroleum – – definition of petroleum
• Natural gas
• Some natural resources are limited

List of important keywords to pay attention

• Coal
• Coal gas
• Coal tar
• Coke
• Fossil fuel
• Natural gas
• Petroleum
• Petroleum refinery

Studying NCERT Solutions is as important as studying the notes and other study materials. NCERT Solutions help you to understand the topic clearly and this aids you in better preparation for the examination.