This quiz works best with JavaScript enabled. Home > Cbse > Class 11 > Science > Chemistry Part Ii > Class 11 Chemistry (Part Ii) Chapter 14 Environmental Chemistry – Quiz 16 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part Ii) Chapter 14 Environmental Chemistry Quiz 16 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which layer contains most of the atmospheric mass? A) Exosphere. B) Troposphere. C) Stratosphere. D) Mesosphere. Show Answer Correct Answer: B) Troposphere. 2. What role do plants play in reducing air pollution? A) Plants have no effect on air quality. B) Plants reduce air pollution by absorbing carbon dioxide, releasing oxygen, filtering pollutants, and absorbing toxins. C) Plants only absorb sunlight and do not filter air pollutants. D) Plants produce more carbon dioxide than oxygen. Show Answer Correct Answer: B) Plants reduce air pollution by absorbing carbon dioxide, releasing oxygen, filtering pollutants, and absorbing toxins. 3. In a test of pH levels, a baking soda has a pH of 9 and bleach has a pH of 12. What is true about there relationship? A) Both of the solution are Bases. B) Both of the solution are Acids. C) The Baking soda is an acid and the Bleach is a base. D) The baking soda is a base and the Bleach is an Acid. Show Answer Correct Answer: A) Both of the solution are Bases. 4. In which form is carbon released during decomposition? A) Carbon dioxide. B) Carbohydrates. C) Carbonate. D) Carbon monoxide. Show Answer Correct Answer: A) Carbon dioxide. 5. A force that holds two atoms together A) Magnetic attraction. B) Nuclear force. C) Chemical bond. D) Gravitational force. Show Answer Correct Answer: C) Chemical bond. 6. Which of the following is a major contributor to eutrophication in aquatic systems? A) Heavy metals. B) Nutrient runoff (nitrates and phosphates). C) Acid rain. D) Ozone depletion. Show Answer Correct Answer: B) Nutrient runoff (nitrates and phosphates). 7. Sweet clover poisoning involves what symptom? A) Vomiting. B) Blindness. C) Hemorrhages. D) Discoloration of the skin. Show Answer Correct Answer: C) Hemorrhages. 8. The name of the liquid created when water seeps through soil, dissolving compounds along the way ..... A) Effluent. B) Contaminant. C) Run off. D) Leachate. Show Answer Correct Answer: D) Leachate. 9. What is the role of carbohydrates in nutrition? A) Structural molecule for the body. B) Energy source for metabolism. C) Storage for unused chemical energy. D) None of the above. Show Answer Correct Answer: B) Energy source for metabolism. 10. Rain or snow containing acid compounds from the air A) Alkaline precipitation. B) Acid precipitation. C) Neutralization. D) None of the above. Show Answer Correct Answer: B) Acid precipitation. 11. What are the primary sources of air pollution? A) Noise pollution from traffic. B) Household cleaning products. C) Industrial emissions, vehicle exhaust, burning of fossil fuels, agricultural activities, natural sources (wildfires, volcanic eruptions). D) Plastic waste disposal. Show Answer Correct Answer: C) Industrial emissions, vehicle exhaust, burning of fossil fuels, agricultural activities, natural sources (wildfires, volcanic eruptions). 12. Which principle is NOT part of green chemistry? A) Prevention of waste. B) Design for degradation. C) Use of toxic substances. D) Atom economy. Show Answer Correct Answer: C) Use of toxic substances. 13. Which energy source is considered carbon neutral? A) Natural gas. B) Biomass. C) Fossil fuels. D) Coal. Show Answer Correct Answer: B) Biomass. 14. Dissolved Oxygen, Acidity, and Heavy Metals in water are all examples of A) Soil Contaminants. B) Chemical Indicators. C) Pesticides. D) Biological Indicators. Show Answer Correct Answer: B) Chemical Indicators. 15. What is oxidation number of Mn in MnO$_{2}$? A) +2. B) +4. C) 0. D) -2. Show Answer Correct Answer: B) +4. 16. What role does Sodium play in the human body? A) Regulates nerve impulses in nerves and muscles. B) Regulates calcium deposition. C) Regulates metabolism as part of thyroid hormone. D) Regulates oxygen transport in red blood cells. Show Answer Correct Answer: A) Regulates nerve impulses in nerves and muscles. 17. Which of the following is lost as heat during energy transfer between trophic levels? A) 100% of energy. B) 50% of energy. C) 10% of energy. D) 90% of energy. Show Answer Correct Answer: D) 90% of energy. 18. What is the recommended number of servings of vegetables and fruit per day for children aged 4-8? A) 4. B) 7. C) 6. D) 5. Show Answer Correct Answer: D) 5. 19. The combining of an acid and a base to produce salt and water A) Neutralization. B) Eutrophication. C) Precipitation. D) Catalytic conversion. Show Answer Correct Answer: A) Neutralization. 20. What is an example of non-persistent chemical waste? A) Plastic. B) Mercury. C) Oil. D) Sewage. Show Answer Correct Answer: D) Sewage. 21. LD50 is the standard used to compare the toxicity of any substance. LD50 means that ..... A) 50% of the test population of animals would die if they consume a specific dose of the toxic substance. B) 50% of the test population of animals would die if they consume any amount of the toxic substance. C) 50 animals would die if they consume a dose of the toxic substance. D) 50% of the animals would die if they consume a dose of the toxic substance. Show Answer Correct Answer: A) 50% of the test population of animals would die if they consume a specific dose of the toxic substance. 22. Which is the best explanation of how fertilizer runoff from a farm might affect a nearby waterway? A) The fertilizer will poison the fish. B) The fertilizer will kill algae. C) The fertilizer will cause an algae bloom. D) The fertilizer will cause the fish to grow. Show Answer Correct Answer: C) The fertilizer will cause an algae bloom. 23. Water pollution includes A) Organisms in water that cause disease. B) Water that is too cold. C) High amounts of dissolved oxygen. D) All of these options. Show Answer Correct Answer: A) Organisms in water that cause disease. 24. Mixing an acid and a base will result in a pH of A) 4-acidic. B) 9-neutral. C) 7-neutral. D) 12-Basic. Show Answer Correct Answer: C) 7-neutral. 25. In which part of the atmosphere O3 is present? A) Troposphere. B) Stratosphere. C) Mesosphere. D) Lithosphere. Show Answer Correct Answer: B) Stratosphere. 26. ..... causes health problems leading to epidemics due to contamination of groundwater. A) Poor waste management. B) Proper waste management. C) Dumping wastes on land. D) Dumping waste in sewerages. Show Answer Correct Answer: A) Poor waste management. 27. Complete combustion happens when methane reacts with plenty of oxygen to form the products ..... A) Carbon dioxide and water. B) Carbon monoxide and water. C) Carbon and water. D) None of the above. Show Answer Correct Answer: A) Carbon dioxide and water. 28. According to the pH scale, which value represents a neutral solution? A) 3. B) 0. C) 10. D) 7. Show Answer Correct Answer: D) 7. 29. What is one of the primary effects of acid rain on the environment? A) It increases the pH level of soil. B) It causes the corrosion of buildings and monuments. C) It enhances plant growth. D) It reduces the amount of sunlight reaching the Earth. Show Answer Correct Answer: B) It causes the corrosion of buildings and monuments. 30. The study if the shapes and features of the Earth's surface A) Lithography. B) Geography. C) Photography. D) Topography. Show Answer Correct Answer: D) Topography. 31. The presence of a species of large trout in a particular lake indicates a A) High dissolved oxygen concentration. B) High water temperature. C) Low water temperature. D) Low dissolved oxygen concentration. Show Answer Correct Answer: A) High dissolved oxygen concentration. 32. Hard water is water that: A) Contains chlorine. B) Boils at a higher temperature. C) Contains fluoride. D) Does not easily form a lather with soap. Show Answer Correct Answer: D) Does not easily form a lather with soap. 33. The natural chemical or physical processes that breaks down rock on Earth's surface. A) Deposition. B) Jackhammering. C) Erosion. D) Weathering. Show Answer Correct Answer: D) Weathering. 34. In a closed thermodynamic system, what can be exchanged with the surroundings? A) Matter only. B) Energy only. C) Both matter and energy. D) Neither matter nor energy. Show Answer Correct Answer: B) Energy only. 35. The reaction, H2O + hv $\rightarrow$ HO* + H, represents A) Destruction of the hydroxyl radical at higher altitudes. B) Formation of the hydroxyl radical in the relatively unpolluted troposphere. C) The strong reactivity of the hydroxyl radical. D) The formation of hydroxyl radical at higher altitudes. Show Answer Correct Answer: D) The formation of hydroxyl radical at higher altitudes. 36. Pollution is described as which of the following? A) The passive movement of molecules from high to low concentration. B) Any harmful change to the environment caused naturally or by human activities. C) The process by which bacteria convert nitrogen gas into usable compounds for plants. D) The chemical breakdown of a compound due to reaction with water. Show Answer Correct Answer: B) Any harmful change to the environment caused naturally or by human activities. 37. The mineral most crucial to red blood cells is A) Iron. B) Calcium. C) Copper. D) Iodine. Show Answer Correct Answer: A) Iron. 38. Which statement best defines pollution? A) Any natural change in weather patterns. B) Harmful changes to air, water, or soil. C) The safe breakdown of substances by living things. D) The process of using plants to clean contaminants. Show Answer Correct Answer: B) Harmful changes to air, water, or soil. 39. Osmosis is specifically: A) The hydrolysis of starch into glucose. B) A type of active transport used by plants. C) The movement of solutes from low to high concentration without energy. D) A special type of diffusion where water moves through a semi-permeable membrane from an area of higher water concentration to an area of lower water concentration. Show Answer Correct Answer: D) A special type of diffusion where water moves through a semi-permeable membrane from an area of higher water concentration to an area of lower water concentration. 40. *When water moves through a membrane from an area of high concentration to an area of low concentration, this is known as A) Dilution. B) Osmosis. C) *active transfer. D) Diffusion. Show Answer Correct Answer: B) Osmosis. 41. Air pollution that occurs in sunlight is(a) oxidising smog(b) fog(c) reducing smog(d) acid rain. A) B. B) C. C) D. D) A. Show Answer Correct Answer: D) A. 42. This can transform nitrogen in the atmosphere into a usable form of nitrogen A) Sun. B) Ice. C) Lightning. D) Rain. Show Answer Correct Answer: C) Lightning. 43. Which term refers to substances plants and animals need, such as nitrogen and phosphorus? A) Toxins. B) Pollutants. C) Nutrients. D) Hazardous waste. Show Answer Correct Answer: C) Nutrients. 44. Excessive release of CO$_{2}$ into the atmosphere results in(a) global warming(b) formation of smog(c) polar vortex(d) depletion of ozone. A) D. B) A. C) C. D) B. Show Answer Correct Answer: B) A. 45. Which is NOT biodegradable? A) Leaves and sticks blown down during a storm. B) Food waste that is being composed. C) Plastic bottles thrown in the ditch. D) Dead animals on the side of the road. Show Answer Correct Answer: C) Plastic bottles thrown in the ditch. 46. Which of the following is a step in the water cycle? A) Precipitation. B) Fermentation. C) Photosynthesis. D) Combustion. Show Answer Correct Answer: A) Precipitation. 47. The oxidation number of nitrogen in N$_{2 }$is A) +3. B) +1. C) 0. D) -3. Show Answer Correct Answer: C) 0. 48. Which one is the most toxic? A) Parts per thousand. B) Parts per million. C) Parts per billion. D) Parts per trillion. Show Answer Correct Answer: A) Parts per thousand. 49. What are some common misconceptions about air pollution? A) Air pollution only affects outdoor air quality. B) Air pollution only affects the respiratory system. C) Air pollution is a localized problem that only affects those living near pollution sources. D) Air pollution only affects urban areas. Show Answer Correct Answer: D) Air pollution only affects urban areas. 50. A mixture of gases that surround the earth A) Ozone Layer. B) Atmosphere. C) Thermosphere. D) Troposphere. Show Answer Correct Answer: B) Atmosphere. 51. The oxidation numbers of all the atoms in H$_{2}$SO$_{4}$ must add up to A) 0. B) +9. C) +5. D) +16. Show Answer Correct Answer: A) 0. 52. Anhydrous copper(II) sulfate can be used to test presence of water. What is the colour change of the copper(II) sulfate when there is water? A) Blue to white. B) Pink to blue. C) White to blue. D) Blue to pink. Show Answer Correct Answer: C) White to blue. 53. Which factor directly affects dissolved oxygen levels in water according to the material? A) Photosynthesis and organism activity, along with turbulence and temperature. B) Presence of sulfur dioxide in the air. C) Amount of carbon monoxide from vehicle emissions. D) Thickness of the ozone layer. Show Answer Correct Answer: A) Photosynthesis and organism activity, along with turbulence and temperature. 54. Identify the CORRECT matching. I. RCO-alkoxyl radical II. RCOOO-acylperoxyl radical III. RO-peroxyl radical IV. HOO-hydroperoxyl radical A) I and II. B) I and III. C) II and IV. D) II, III and IV. Show Answer Correct Answer: C) II and IV. 55. Which statement best describes chemicals in the environment? A) Only living things are made of chemicals, while non-living things are not. B) Everything in the environment-living or non-living-is made of chemicals. C) Chemicals exist only in water and air, not in soil or rocks. D) Only man-made materials count as chemicals in environmental science. Show Answer Correct Answer: B) Everything in the environment-living or non-living-is made of chemicals. 56. The three elements commonly found in fertilizers are nitrogen, phosphorus, and potassium. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 57. Which of these processes absorbs carbon dioxide? A) Respiration. B) Combustion of fossil fuels. C) Photosynthesis. D) None of the above. Show Answer Correct Answer: C) Photosynthesis. 58. *A substance has a pH reading of 3.1 is considered A) *strong base. B) *strong acid. C) Neutral. D) *weak acid. E) *weak base. Show Answer Correct Answer: B) *strong acid. 59. Which gas is most associated with global warming? A) Helium. B) Oxygen. C) Hydrogen. D) Carbon dioxide. Show Answer Correct Answer: D) Carbon dioxide. 60. When copper and magnesium sulphate are mixed together, there is no reaction. Why? A) Copper is more reactive than magnesium. B) Magnesium is more reactive than copper. C) Magnesium Sulphate never reacts with metals. D) Copper never reacts with metal salts. Show Answer Correct Answer: B) Magnesium is more reactive than copper. ← PreviousNext →Related QuizzesScience QuizzesClass 11 QuizzesClass 11 Chemistry (Part Ii) Chapter 14 Environmental Chemistry Quiz 1Class 11 Chemistry (Part Ii) Chapter 14 Environmental Chemistry Quiz 2Class 11 Chemistry (Part Ii) Chapter 14 Environmental Chemistry Quiz 3Class 11 Chemistry (Part Ii) Chapter 14 Environmental Chemistry Quiz 4Class 11 Chemistry (Part Ii) Chapter 14 Environmental Chemistry Quiz 5Class 11 Chemistry (Part Ii) Chapter 14 Environmental Chemistry Quiz 6Class 11 Chemistry (Part Ii) Chapter 14 Environmental Chemistry Quiz 7Class 11 Chemistry (Part Ii) Chapter 14 Environmental Chemistry Quiz 8 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books