1. Write the names of two natural substances.2. What is the purest form of carbon?3. What is the main use of coke?4. Name two fractions of petroleum>5. Why petroleum is called black gold?6. Expand PCRA.7. What are natural resources? Explain with examples.8. What are fossil fuels? Name main fossil fuel.9. What is coal tar? What are its uses?10. Why CNG is called clean fuel?11. State some harmful effects of using fossil fuels?12. What are petrochemicals?
Answers
Answer:
2 ans diamond.10 cng is called clean fuel because it burns without smog.12chemical those we get from rock is called petrochemical, in Greek languages rock called petro.
Answer:
1.coal and petroleum
2.Diamond
3Coke is used as a fuel and as a reducing agent in smelting iron ore in a blast furnace
4.petrol; diesel
5 when crude oil is extracted it is black in color . People call it gold because of its oils and value
6.Petroleum Conservation Research Association
7.A natural resource is a which people can use and it comes from the natural environment. Examples of natural resources are air, water, wood, oil, wind energy, natural gas, iron, and coal.
8.fossils fuels are formed by the decaying of plants and animals which have been buried under earth for millions of years.in high temperature and pressure in the absence of air.
9.Coal tar is a thick dark liquid which is a by-product of the production of coke and coal gas from coal. It has both medical and industrial uses.
10CNG compressed natural gas is also known as clean fuel because it cause less pollution as compared to other source of fuels like coal. carbon dioxide and nitrogen oxide as well as the sulphur oxide are produced less than the petroleum or coal etc.
it is used to power vehicles, mostly buses and trucks. To make it usable as a transportation fuel, the natural gas. it is compressed and liquefied.
11.green house gases will be produced in high amount. pollution increses.their extraction process make large amount of pollution.pollution caused by them may lead to many diseases.
12Petrochemicals are chemical products derived from petroleum.