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Question 1., , What are the advantages of using CNG and LPG, as fuels?, , Answer:, , The advantages of using CNG and LPG as fuels, are:, , e They burn with a smokeless flame and so, does not cause any pollution., e They leave no ash on burning., , e They are easy to handle and convenient to, store., , Question 2., , Name the petroleum product used for surfacing, of roads., Answer:, , Bitumen, , Scanned with CamScanner

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Question 3., , Describe how coal is formed from dead, vegetation. What is this process called?, , Answer:, , Millions of years ago, trees, plants, ferns and, forests got buried below the rocks, soil and sand, due to natural processes like flooding,, earthquake, etc. Slowly, as more soil deposited, over them, they were compressed. This led to the, conditions of high pressure and heat. These, conditions along with the anaerobic conditions, turned the carbon-enriched organic matter of, wood into coal., , This slow process of conversion of wood into, coal is called carbonisation., , Scanned with CamScanner

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called’?, , 4. Fillin the blanks. note} qos, (a) Fossi? fuels are Co ad E etYo eum _ CHG, , (b) Process_of separation of different constituents from petroleum is, called ReLinin, , er Least polluting ae vehicle is CNG __, , C4 Tick True/False against the following statements., , (a) Fossil fuels can be made in the laboratory. (1/F) > E, , (b) CNG is more polluting fuel than petrol. (T/F) > 4, (c) Coke is almost pure form of carbon. (1/F) > T :, (d) Coal tar is a mixture of various substances. (T/F) —> T, , (e) Kerosene is not a fossil fuel. {T/F) —> F :, , 6. Explain why fossil fuels are exhaustibie natural resources. :

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Question 6., , Explain why fossil fuels are exhaustible natural, resources., , Answer:, , Fossil fuels take millions of years to be formed., They are limited in nature and cannot be, replenished easily, once consumed. Hence, they, are considered as exhaustible natural resources., , Question 7., , Describe the characteristics and uses of coke., Answer:, , Characteristics of coke: Coke is 98% pure carbon., It is a tough, porous and black substance. It produces a very little smoke., , Uses of coke: Coke is very useful as fuel. It is a, good reducing agent. It is widely used in, metallurgical processes to reduce metals from, their oxides. It is used for producing water gas., , Scanned with CamScanner

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Question 8., , Explain the process of the formation of, petroleum., , Answer:, , Petroleum is formed by the burial of aquatic, plants and animals below the sea bed. The, marine animals and plants died thousands of, years ago and settled down in the bottom of sea., In anaerobic conditions, microorganisms, decompose this organic matter. Due to high, pressure and heat, the dead remains of tiny, plants and animals were slowly converted into, petroleum., , Scanned with CamScanner