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Environmental Chemistry Test - 18

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Environmental Chemistry Test - 18
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Which of the following is not properly matched?
    Solution
    • Formaldehyde is classified as a probable human carcinogen under conditions of unusually high or prolonged exposure.
    • Sulphur dioxide can cause respiratory problems such as bronchitis and can irritate your nose, throat and lungs. 
    • Nitric oxide becomes brown when released in the air because nitric oxide combines with oxygen to give nitrogen dioxide which is brown in colour.
    • Photochemical smog is composed of primary and secondary pollutants. It is the chemical reaction of sunlight, nitrogen oxides, and volatile organic compounds in the atmosphere, which leaves airborne particles and ground-level ozone.
    • Photochemical smog does not match with green air because green air refers to air that is free from pollution. 

    So, the correct answer is option D.
  • Question 2
    1 / -0
    Freon gas causing stratospheric $$O_{3}$$ depletion is mainly released from
    Solution
    Freon or Aerosols or Chlorofluorocarbons (CFCs) are the chemicals used as refrigerants, propellants and solid plastic foams. The chemicals are also released as  aerosol by jets. Along with nitrous oxide, CFCs react with ozone of ozonosphere and deplete the same.
    So, the correct answer is 'Refrigerator'
  • Question 3
    1 / -0
    Which one of the following chemicals is responsible for the reduction of ozone content of atmosphere?
    Solution
    Chlorofluorocarbons or Chlorofluoromethane are also known as freon or aerosols. They are chemicals used as refrigerants, propellants and solid plastic foams. These chemicals are also released as aerosols by jets flying at high altitudes. Along with nitrogen oxides, chlorofluorocarbons react with ozone of ozonosphere and depletes the same. Chlorofluorocarbons release reactive chloride which directly reacts with ozone molecules setting a chain reaction.
  • Question 4
    1 / -0
    Good ozone is found in 
    Solution
    The correct answer is Stratosphere. Option C
    Ozone occurs in the Earth's upper atmosphere—10 to 30 miles above the Earth's surface and protects from the sun's harmful ultraviolet (UV) rays Stratospheric ozone is formed naturally by chemical reactions involving solar ultraviolet radiation (sunlight) and oxygen molecules.
  • Question 5
    1 / -0
    Protective layer of ozone in the atmosphere exists in which layer?
    Solution
    The ozone layer exists in the lower regions of the stratosphere. Its altitude and thickness may vary depending on the geographical area but it extends over the entire globe. The ozone has a protective role in the upper atmosphere where it prevents the intense UV rays from reaching the earth's surface.
  • Question 6
    1 / -0
    Photochemical smog pollution does not contain
    Solution
    Photochemical smog is formed from secondary pollutants. It is formed due to automobile exhausts. Nitrogen dioxide splits into nitric oxide and nascent oxygen. Nascent oxygen forms ozone. Ozone, nitric oxide and hydrocarbons form PAN. Carbon dioxide is not related to formation of Photochemical smog. Carbon dioxide is an important green house gas and increased production of carbon dioxide leads to global warming. Thus, the correct answer is option A.
  • Question 7
    1 / -0
    The correct statements among the following is:
    Solution
    Green Chemistry is the design of chemical products and processes that reduce or eliminate the generation of hazardous substances.
    Fly ash, is one of the residues generated in combustion, and comprises the fine particles that rise with the flue gases.
    Green fuel is that obtained from plastic wastes and other wastes.
  • Question 8
    1 / -0
    CFC are not recommended to be used in refrigerators because they
    Solution
    Ozone depleting substances (ODS) are substances, which react with ozone present in the stratosphere and destroy the same. The major ODS are chlorofluorocarbons (14 percent of total depletion), nitrogen oxides (3 to 5 percent of total depletion), sulphur dioxides, halon, carbon tetrachloride, methane, methyl chloroform etc.
  • Question 9
    1 / -0
    Photochemical smog always contains
    Solution
    Photochemical smog always contains $$O_3$$ (ozone). It is the chemical reaction of sunlight, nitrogen oxides and volatile organic compounds in the atmosphere, which leaves airborne particles and ground-level ozone. One of the primary components of photochemical smog is ozone. While the ozone in the stratosphere protects the earth from harmful UV radiation, ozone on the ground is hazardous to human health. Ground-level ozone is formed when vehicle emissions containing nitrogen oxides (primarily from vehicle exhaust) and volatile organic compounds (from paints, solvents, and fuel evaporation) interact in the presence of sunlight. 
  • Question 10
    1 / -0
    Phosphate pollution is caused by:
    Solution

    A. Correct Option: D

    B. Explanation for the correct option:

    • Phosphate pollution is directly linked with the production of untreated sewage wastes and agricultural fertilizers into the water body.
    •  An agricultural fertilizer such as phosphate is an important compound of fertilizers used in the crop fields which is further passed down to the water bodies.
    •  Phosphate stimulates algae growth and causes algal bloom and affects the water quality which is very unsafe to the different species living in the water bodies.  

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