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
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.
A river receives untreated sewage from a nearby town. What immediate effect is most likely to occur in the river's ecosystem? (1) Increase in dissolved oxygen (2) Decrease in dissolved oxygen (3) Decrease in bacteria population (4) Increase in fish population
Calculate the BOD if 10 mg/L of dissolved oxygen is consumed in 5 days by microorganisms in a 1-liter water sample.
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?
A river receives untreated sewage from a nearby town. What immediate effect is most likely to occur in the river's ecosystem? (1) Increase in dissolved oxygen (2) Decrease in dissolved oxygen (3) Decrease in bacteria population (4) Increase in fish population
Which chemical is commonly used to disinfect water in treatment plants? (1) Chlorine (2) Ammonia (3) Nitrogen (4) Sulfur dioxide
Which of the following is a chemical indicator of water pollution? (1) pH (2) Temperature (3) Turbidity (4) All of the above
Which of the following is a consequence of water pollution? (1) Loss of biodiversity (2) Increased agricultural yield (3) Improved water quality (4) Enhanced fish population
Fill in the blank: The presence of __________ bacteria in water indicates possible contamination by fecal matter.
Fill in the blank: The presence of excess __________ in water leads to algal blooms.
Fill in the blank: The process of removing dissolved salts from seawater to obtain fresh water is called __________.
The maximum permissible limit of lead in drinking water as per WHO guidelines is __________ mg/L.
True or False: Eutrophication is caused by excessive nutrients in water bodies.
True or False: Nitrates in drinking water can cause methemoglobinemia (blue baby syndrome) in infants.
True or False: Oil spills only affect marine life and not humans.
True or False: Thermal pollution increases the dissolved oxygen content in water.
