Question

are exhaustible natural resources ?
3. What is the commercial importance of coal tar?
4. What is compressed natural gas ?
B. SHORT ANSWER TYPE QUESTIONS
1. What are fossil fuels ? Give two examples.
2. What are petrochemicals ? What are their uses ?
3. How is petroleum refined ?
4. What is global warming ?
C. LONG ANSWER TYPE QUESTIONS
1. How is coal formed ?
2. What makes natural gas a clean and green fuel ?
3. Name the various components obtained from the fractional distillation of crude oil. Mention at least
use of each.
4. Why is petroleum called black gold ?
5. Natural resources should be used judiciously. Justify the statement.
CHOOSE THE CORRECT ANSWER
1. Air, water and sunlight are
(a) non-renewable resources
(c) exhaustible resources
(b) renewable resources
(d) all of these
2. The slow
nra​

Answer 1

Explanation:

1. exhaustible natural resources are fossil fuels such as oil, coal, and natural gas, as well as minerals like iron, copper, and aluminium.
2. 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.
3. Compressed natural gas is a fuel that can be used in place of gasoline, diesel fuel and liquefied petroleum gas. CNG combustion produces fewer undesirable gases than the aforementioned fuels.
4. Fossil fuels are made from decomposing plants and animals. These fuels are found in the Earth's crust and contain carbon and hydrogen, which can be burned for energy. Coal, oil, and natural gas are examples of fossil fuels.
5. Products made from petrochemicals include: plastics, soaps, detergents, solvents, paints, drugs, fertilizer, pesticides, synthetic fibers and rubbers, and flooring and insulating materials. Petrochemicals are used to make such common products as aspirin, cars, clothing, electronic equipment, furniture, and much more.
6. The first part of refining crude oil is to heat it until it boils. The boiling liquid is separated into different liquids and gases in a distillation column. These liquids are used to make petrol, paraffin, diesel fuel etc. ... The boiling oil turns into a mixture of gases in the column.
7. Global warming is the unusually rapid increase in Earth's average surface temperature over the past century primarily due to the greenhouse gases released by people burning fossil fuels.
8. Coal is mostly carbon with variable amounts of other elements; chiefly hydrogen, sulfur, oxygen, and nitrogen. Coal is formed when dead plant matter decays into peat and is converted into coal by the heat and pressure of deep burial over millions of years.