Water Pollution
Chemistry ⇒ Environmental Chemistry
Water Pollution starts at 9 and continues till grade 12.
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See sample questions for grade 11
Calculate the BOD if 10 mg/L of dissolved oxygen is consumed in 5 days by microorganisms in a 1-liter water sample.
Describe the impact of microplastics on aquatic ecosystems.
Describe the process of eutrophication and its environmental impact.
Describe two methods for preventing water pollution.
Explain how agricultural runoff leads to water pollution.
Explain how heavy metals such as mercury and lead can affect aquatic life.
Explain the difference between biodegradable and non-biodegradable pollutants with examples.
Explain the term 'biochemical oxygen demand' (BOD) and its significance in water pollution studies.
Name the process used to remove suspended solids from wastewater in treatment plants.
Name two common diseases caused by drinking contaminated water.
What is the main chemical component of acid rain that contributes to water pollution?
What is the main reason for the presence of arsenic in groundwater in some regions?
A lake near an industrial area shows a sudden increase in fish mortality. Laboratory analysis reveals high concentrations of cadmium and low dissolved oxygen levels. Explain the possible sources of cadmium in the water and describe the chemical processes that could lead to decreased oxygen levels.
A sample of river water contains 0.5 mg/L of phosphate ions. If the maximum safe limit for phosphate in surface water is 0.1 mg/L, by what factor does the sample exceed the safe limit?
Describe how thermal pollution can alter the solubility of gases in water and its impact on aquatic organisms.
Explain the chemical mechanism by which chlorine disinfection can lead to the formation of harmful by-products in drinking water.
