5. Coal And Petroleum Class 8 Science [LATEST] Solutions Chapter Review in English - CBSE Study
NCERT Solutions for Class 8 Science are carefully prepared according to the latest CBSE syllabus and NCERT textbooks to help students understand every concept clearly. These solutions cover all important 5. Coal And Petroleum with detailed explanations and step-by-step answers for better exam preparation. Each Chapter Review is explained in simple language so that students can easily grasp the fundamentals and improve their academic performance. The study material is designed to support daily homework, revision practice, and final exam preparation for Class 8 students. With accurate answers, concept clarity, and structured content, these NCERT solutions help learners build confidence and score higher marks in their examinations. Whether you are revising a specific topic or preparing an entire chapter, this resource provides reliable and syllabus-based guidance for complete success in Science.
Class 8 English Medium Science All Chapters:
5. Coal And Petroleum
1. Chapter Review
Chapter Review:
- 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.
- These resources are present in unlimited quantity in nature is called Inexhaustible. Examples are: sunlight, air.
- The amount of these resources in nature is limited are called exhaustible. Examples of these resources are forests, wildlife, minerals, coal, petroleum, natural gas etc.
- The dead remains of living organisms (fossils). So, these are all known as fossil fuels.
- As coal contains mainly carbon, the slow process of conversion of dead vegetation into coal is called carbonisation.
- Coke is a tough, porous and black substance. It is almost pure form of
carbon.It is used in the manufacture of steel. - Coal tar is a black, thick liquid with unpleasant smell. It is a mixture of about 200 substances.
- Petrol and diesel are obtained from a natural resource called petroleum.
- The world’s first oil well was drilled in Pennsylvania, USA, in 1859.
- Great commercial importance, petroleum is also called ‘black gold’.
- The process of separating the various constituents fractions of petroleum is known as refining. It is carried out in a petroleum
refinery. - Natural gas is a very important fossil fuel because it is easy to transport through pipes.
- CNG is used as a fuel for transport vehicles because it is less polluting.
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