Atmospheric Pollution Quiz - ICSE Class 9 Chemistry

Free practice quiz: Atmospheric Pollution (ICSE Class 9 Chemistry). 49 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. The phenomenon of 'acid rain' is primarily caused by the atmospheric release of:

   1. Methane and Ozone
   2. Chlorofluorocarbons (CFCs) and Carbon Monoxide (CO)
   3. Sulfur Dioxide (SO2) and Nitrogen Oxides (NOx)
   4. Particulate Matter and Lead
   Show answer

   Answer: C. Sulfur Dioxide (SO2) and Nitrogen Oxides (NOx)

   Acid rain is formed when sulfur dioxide (SO2) and nitrogen oxides (NOx) react with water, oxygen, and other chemicals in the atmosphere to form sulfuric and nitric acids. These acids then mix with rain, snow, fog, or dust.

2. Which industrial process is a major source of sulfur dioxide (SO2) emissions?

   1. Cement production
   2. Paper and pulp manufacturing
   3. Smelting of sulfide ores
   4. Fertilizer production
   Show answer

   Answer: C. Smelting of sulfide ores

   The smelting of sulfide ores, a process used to extract metals from their ores, releases significant amounts of sulfur dioxide (SO2) as a byproduct when these sulfur-containing compounds are heated in the presence of air.

3. Which of the following is a primary air pollutant that can cause respiratory irritation and damage lung tissue?

   1. Nitrous Oxide (N2O)
   2. Ozone (O3)
   3. Carbon Dioxide (CO2)
   4. Nitrogen (N2)
   Show answer

   Answer: B. Ozone (O3)

   Ground-level ozone (O3) is a powerful oxidant that can irritate the respiratory system, aggravate asthma, and damage lung tissue. Unlike stratospheric ozone which protects us from UV radiation, ground-level ozone is a harmful air pollutant.

4. Which air pollutant can directly damage plant leaves, reduce crop yields, and cause premature aging of human skin?

   1. Carbon Monoxide (CO)
   2. Sulfur Dioxide (SO2)
   3. Ground-level Ozone (O3)
   4. Nitrogen Monoxide (NO)
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   Answer: C. Ground-level Ozone (O3)

   Ground-level ozone is a phytotoxicant, meaning it can damage plants by interfering with photosynthesis and causing visible leaf injury. It also acts as an oxidant on human skin and respiratory tissues.

5. A severe reduction in the concentration of dissolved oxygen in water bodies, leading to the death of aquatic life, is known as:

   1. Ocean acidification
   2. Eutrophication
   3. Hypoxia
   4. Acidification
   Show answer

   Answer: C. Hypoxia

   Hypoxia refers to a state in which oxygen is not available in sufficient quantities for aquatic organisms. Eutrophication often leads to hypoxia as decomposers consume oxygen during the breakdown of excess organic matter.

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