Atmospheric Pollution Goyal Brother Chemistry Solutions for ICSE Class-9 Ch-8. We Provide Answer related Acid rain, Global warming, Green House Effect/Gases , Carbon Cycle Ozone Depletion . Visit official Website CISCE for detail information about ICSE Board Class-9.
Ch-8 Atmospheric Pollution Goyal Brother Chemistry Solutions for ICSE Class-9
| Board | ICSE |
| Publications | Goyal Brother Prakashan |
| Subject | Chemistry |
| Class | 9th |
| Writer | Dr. S.K. Aggarwal |
| Chapter-8 | Atmospheric Pollution |
| Topics | Solutions of Exercises-8 |
| Edition | for 2022-2023 Academic Session |
Ch-8 Atmospheric Pollution
Goyal Brother Prakashan ICSE Class-9 Chemistry Solutions
(Page- 157)
Questions 1. How is acid rain caused?
Answer : Acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. These substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain
Questions 2. Briefly state problems created by the acid rain.
Answer : Dead or dying trees are a common sight in areas effected by acid rain. Acid rain leaches aluminum from the soil. That aluminum may be harmful to plants as well as animals. Acid rain also removes minerals and nutrients from the soil that trees need to grow
Questions 3.
(a) Define the term global warming.
(b) Name three gases responsible for global warming.
Answer :
(a) Global warming is the long-term heating of Earth’s surface observed since the pre-industrial period due to human activities, primarily fossil fuel burning, which increases heat-trapping greenhouse gas levels in Earth’s atmosphere
(b) gases responsible for global warming.
- Carbon Dioxide.
- Methane.
- Nitrous Oxide.
- Fluorinated Gases.
Questions 4. Briefly describe the nature of infrared rays.
Answer : Infrared waves, or infrared light, are part of the electromagnetic spectrum. People encounter Infrared waves every day; the human eye cannot see it, but humans can detect it as heat. A remote control uses light waves just beyond the visible spectrum of light—infrared light waves—to change channels on your TV.
Questions 5. What do you understand by the term greenhouse effect?
Answer : The greenhouse effect is a natural process that warms the Earth’s surface. When the Sun’s energy reaches the Earth’s atmosphere, some of it is reflected back to space and some is absorbed and re-radiated by greenhouse gases
Questions 6. Describe the role of carbon dioxide in greenhouse effect.
Answer : Gases in the atmosphere, such as carbon dioxide, trap heat similar to the glass roof of a greenhouse. These heat-trapping gases are called greenhouse gases. During the day, the Sun shines through the atmosphere. Earth’s surface warms up in the sunlight
Questions 7. Why are not nitrogen and oxygen called greenhouse gases?
Answer : Oxygen and nitrogen are not greenhouse gases, because they are transparent to infrared light. These molecules are invisible because when you stretch one, it doesn’t change the electric field.
Questions 8. How is ozone layer formed in the atmosphere?
Answer :Ozone is a molecule made up of three oxygen atoms, often referenced as O3. Ozone is formed when heat and sunlight cause chemical reactions between oxides of nitrogen (NOX ) and Volatile Organic Compounds (VOC), which are also known as Hydrocarbons.
Questions 9. How does ozone layer protect living beings on the surface of the earth?
Answer : The ozone layer acts as a shield for life on Earth. Ozone is good at trapping a type of radiation called ultraviolet radiation, or UV light, which can penetrate organisms’ protective layers, like skin, damaging DNA molecules in plants and animals
Questions 10. Name three gases which destroy ozone layer.
Answer : gases which destroy ozone layer.
- chlorofluorocarbons (CFCs)
- halons.
- methyl bromide.
- carbon tetrachloride.
- methyl chloroform.
Questions 11. What consequences will follow the destruction of the ozone layer?
Answer : Ozone layer depletion increases the amount of UVB that reaches the Earth’s surface. Laboratory and epidemiological studies demonstrate that UVB causes non-melanoma skin cancer and plays a major role in malignant melanoma development.
Questions 12. Suggest two methods to control the destruction of the ozone layer.
Answer : Avoid the consumption of gases dangerous to the ozone layer, due to their content or manufacturing process. Some of the most dangerous gases are CFCs (chlorofluorocarbons), halogenated hydrocarbon, methyl bromide and nitrous oxide. Minimize the use of cars. The best transport option is urban, bicycle, or walking
Questions 13. How does the percentage of oxygen in the atmosphere remain constant, inspite of the fact that a large amount of it is used tor combustion and respiration?
Answer : Oxygen is used for combustion and respiration but we release CO2 . Plants take in carbon dioxide and give out oxygen. Hence, the amount of oxygen remains the same.
Questions 14. State the ways by which large amount of carbon dioxide enters the atmosphere.
Answer : Carbon dioxide is added to the atmosphere naturally when organisms respire or decompose (decay), carbonate rocks are weathered, forest fires occur, and volcanoes erupt. Carbon dioxide is also added to the atmosphere through human activities, such as the burning of fossil fuels and forests and the production of cement.
Questions 15. State the ways by which carbon dioxide present in the air is removed.
Answer : Photosynthesis removes carbon dioxide naturally — and trees are especially good at storing carbon removed from the atmosphere by photosynthesis
Questions 16. Define the term carbon dioxide cycle.
Answer : The carbon cycle is nature’s way of reusing carbon atoms, which travel from the atmosphere into organisms in the Earth and then back into the atmosphere over and over again. Most carbon is stored in rocks and sediments, while the rest is stored in the ocean, atmosphere, and living organisms
— End of Atmospheric Pollution Goyal Brother Chemistry Solutions for ICSE Class-9 Ch-8:–
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