NCERT Solutions for Class 8 Science Chapter 5 Coal and Petroleum
You will find NCERT Solutions for Class 8 Science Chapter 5 Coal and Petroleum here are curated by the experts in a comprehensive which can be helpful in clearing your doubts instantly. You will be able to pull together ideas that have been recorded and ensure great marks in the exams. It will help in developing a wider body of knowledge when you’re brainstorming a solution. These Science NCERT Solutions are curated by the experts in a comprehensive which can be helpful in clearing your doubts instantly.
Through these Chapter 5 Coal and Petroleum Class 8 Science NCERT questions and answers, students should not waste time and adopt a strategy that helps them operate and learn at maximum efficiency. Students should also refer previous year questions and practise test papers and worksheets to assess their key areas. You will be able to develop the higher-order thinking capabilities that will help you in prioritising your understandings.
NCERT Solutions for Class 8 Science Chapter 5 Coal and Petroleum
NCERT Textbook will provide you with a lot of interesting topics thus these NCERT Solutions will be useful in understanding in depth concepts well. NCERT Solutions for Class 8 Science Chapter 5 will improve your awareness skills sharply and you can easily memorize more things precisely. You develop the ability to effectively respond to the high end questions that you’re confronted with.
| Study Material for Class 8 Science Chapter 5 Coal and Petroleum |
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Page No: 62
Exercise
1. What are the advantages of using CNG and LPG as fuels?
Answer
The advantages of using compressed natural gas (CNG) and liquified petroleum gas (LPG) as fuels are:
→ They can be burnt directly.
→ They can be transported easily through pipe lines.
→ They are clean fuels and do not give smoke when burnt.
→ They give a lot of heat energy when burnt.
2. Name the petroleum product used for surfacing of roads.
Answer
Bitumen, a petroleum product, is used for surfacing roads.
3. Describe how coal is formed from dead vegetation. What is this process called?
Answer
Millions of years ago, dense forests got buried under the soil due to natural processes like storms, floods, and earthquakes. These got compressed as more and more soil got deposited over them. When they got buried deep in the soil, they were exposed to very high pressure and temperature. Under these conditions, these slowly got converted into coal. This process of formation of coal from dead vegetation is called carbonization.
4. Fill in the banks.
(a) Fossil fuels are ________, ________and _________.
(b) Process of separation of different constituents from petroleum is called _________.
(c) Least polluting fuel for vehicles is __________.
Answer
(a) Fossil fuels are coal, petroleum and natural gas.
(b) Process of separation of different constituents from petroleum is called refining.
(c) Least polluting fuel for vehicles is CNG.
5. Tick True/False against the following statements.
► False
(b) CNG is more polluting fuel than petrol. (T / F)
► False
(c) Coke is almost pure form of carbon. (T / F)
(d) Coal tar is a mixture of various substances. (T / F)
► True
(e) Kerosene is not a fossil fuel. (T / F)
6. Explain why fossil fuels are exhaustible natural resources.
Answer
Fossil fuels require millions of years to form from the dead vegetation and animals that get buried deep inside the Earth. They require high temperature and pressure for their formation, which cannot be provided in the laboratory. Thus, fossils are limited. Therefore, the use of fossil fuels at this rate will lead to their exhaustion.
Page No: 63
7. Describe characteristics and uses of coke.
Answer
Characteristics of coke are:
→ Tough
→ Porous
→ Black in colour
Uses of coke:
→ In manufacture of steel.
→ In the extraction of metals (as a reducing agent).
8. Explain the process of formation of petroleum.
Answer
Petroleum was formed from dead organisms that got buried in the sea millions of years ago. These dead bodies got covered with layers of sand and clay. Lack of air, high temperature, and high pressure transformed these dead organisms into petroleum and natural gas.
9. 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
2
3
4
5
6
7
|
1991
1992
1993
1994
1995
1996
1997
|
7.9
7.8
8.3
7.4
7.1
9.2
11.5
|
Answer
Chapter 5 Coal and Petroleum Class 8 Science NCERT Solutions
These Class 8 Science NCERT Solutions are prepared as per the accordance of latest CBSE guidelines so you can score maximum marks. You can pinpoint your weaknesses and prepare accordingly to change it in a positive way. It will be useful in expanding student's horizon as it cover variety of questions.
Class 8 Science Chapter 5 Coal and Petroleum NCERT Questions and Answers - Topics
• Coal
→ Coke
→ Coal Tar
→ Coal Gas
• Petroleum
→ Refining of Petroleum
• Natural Gas
• Some Natural Resources are Limited
Chapter 5 Coal and Petroleum NCERT Solutions for Class 8 Science - Notes
• Inexhaustible Natural Resources: The resources which are present in unlimited quantity in nature and are not likely to be exhausted by human activities are called inexhaustible natural resources. Air and sunlight are examples.
• Exhaustible Natural Resources: The resources which are limited in the nature and can be exhausted very soon by human activities are called exhaustible natural resources. Coal, petroleum, minerals are examples.
• Fossil Fuels: The fuels formed by the remains of dead plants and animals are called fossil fuels.
• Coal is formed from the remains of vegetation. As coal contains mainly carbon, the slow process of conversion of dead vegetation into coal is called carbonisation.
→ Coal is one of the fuels used to cook food. It is also used in thermal power plants to produce electricity. and also used as a fuel in various industries.
→ When heated in air, coal burns and produces mainly carbon dioxide gas. Coal is processed in industry to get some useful products such as coke, coal tar and coal gas.
→ Coke: It is a tough, porous and black substance obtained from coal. It is an almost pure form of carbon.
→ Coal tar. It is a black, thick liquid obtained as the product during the processing of coal to get coke. Its many products are used as starting materials for manufacturing a large number of substances such as dyes, drugs, perfumes, naphthalene balls.
→ Coal Gas: It is a gas obtained during the processing of coal to get coke. It can be used as a source of light and heat.
• Petroleum was formed from organisms living in the sea. Petroleum is a dark oily liquid. It has an unpleasant odour. It is a mixture of various constituents such as petroleum gas, petrol, diesel, lubricating oil, paraffin wax, etc.
→ The process of separating the various constituents/fractions of petroleum is called refining. It is carried out in a petroleum refinery.
• Natural Gas is a very important fossil fuel. Natural gas is stored under high pressure as compressed natural gas (CNG). CNG is very less polluting and cheaper fuel.
Chapter 5 Coal and Petroleum Class 8 Science Questions and Answers - MCQ Questions with answers
1. Coal was formed during:
a) Devonian period
b) Carboniferous period
c) Silurian period
d) Carbonian period
► b) Carboniferous period
2. Coal gas can be obtained from:
a) burning coke with petroleum
b) coal beds and destructive distillation of coal
c) only fractional distillation of coal
d) only destructive distillation of coal
► b) coal beds and destructive distillation of coal
3. Gaseous mixture containing more volatile components of petroleum is called:
a) biogas
b) coal gas
c) water gas
d) natural gas
► d) natural gas
4. The youngest form of coal is:
a) litter
b) peat
c) anthracite
d) lignite
► b) peat
5. When heated in air, coal burns to produce:
a) Carbonates
b) Carbon dioxide gas
c) Oxygen gas
d) Chlorofluorocarbons
► b) Carbon dioxide gas
6. By what process is petroleum refined?
a) Fractional distillation
b) Destructive distillation
c) Distillation
d) All of the above
► a) Fractional distillation
7. Why is kerosene oil regarded more suitable than petrol in oil lamps?
a) Kerosene is heavier.
b) Kerosene is expensive.
c) Kerosene is less volatile.
d) Kerosene is more volatile.
► c) Kerosene is less volatile.
8. What does gobar gas produced from animal and plant waste contain?
a) Ethane
b) Methane
c) Propane
d) Acetylene
► b) Methane
9. The category of coal which is better known as brown coal is:
a) lignite
b) magnetite
c) bituminous
d) anthracite
► a) lignite
10. Which of the forms of coal has the highest percentage of carbon?
a) Anthracite
b) Bituminous
c) Peat
d) Lignite
► a) Anthracite
NCERT Solutions are helpful resources that can help you not only cover the entire syllabus but also provide in depth analysis of the topics. It will let you explore answers of those questions which you're finding difficult to solve. Given NCERT Solutions for Class 8 Science are available in understandable language and encourage students to learn new topics.