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प्रश्न
Although coal and petroleum are produced by the degradation of biomass, even then we need to conserve them. Why?
उत्तर
Coal and petroleum are the fossil fuels and their supply is limited on the Earth. Therefore, we need to conserve them. They are made by the degradation of biomass, but this practise takes millions of years.
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संबंधित प्रश्न
There are two important fuels A and B both of which are extracted from deep inside the earth. Fuel A is a thick, dark, foul smelling liquid whereas fuel B is a black solid. Combustion of both the fuels produces products, C, D, E and F. The product C makes the rainwater only slightly acidic but it is mainly responsible for causing global warming. The product D is neither acidic nor basic. It is harmless and does not affect the environment in any way. Both E and F attack breathing system of humans and are mainly responsible for causing acid rain. In addition to combustion of fuels A and B, the product F is also formed when lightning occurs in the sky.
(a) What are (i) fuel A, and (ii) fuel B?
(b) Name (i) C (ii) D (iii) E, and (iv) F
(c) What is the process of formation of F during lightning known as?
(d) Which fuel is supposed to be exhausted sooner : A or B?
(e) Which fuel is mostly used for generating electricity at thermal power plants?
While discussing about coal and petroleum a teacher told his students about PCRA's (Petroleum Conservation Research Association) guidelines to save the fossil fuels while driving vehicles. Deepa was going to her school with her mother who was driving car. At the traffic signal, when the light was red, Deepa suggested her mother to switch of the engine.
After reading the above passage, answer the following questions :
(a) Fossil fuels are natural resources, then why do we need to conserve them?
(b) List any two ways of saving the fossil fuels.
(c) State two values exhibited to Deepa.
What are fossil fuels?
Write an answer to the following question in your own words.
Make a list of the components we obtain from mineral oil.
Match the following.
| Octane rating | Diesel |
| Cetane rating | Methane |
| Simplest hydrocarbon | Petrol |
| Peat | Bown in colour |
| Lignite | First stage coal |
What is known as destructive distillation? Write about the products obtained from fractional distillation of petroleum.
Fill in the blanks in the following sentence.
Petroleum, ______ and ______ are fossil fuels.
Coal and petroleum are formed from the dead remains of organisms and are known as ______.
Excessive burning of fossil fuels is a major cause of ______.
Crude oil is used as a sealant for waterproofing various surfaces.
