Waste Management and Recycling
Chemistry ⇒ Environmental Chemistry
Waste Management and Recycling starts at 11 and continues till grade 12.
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See sample questions for grade 12
Describe one chemical method for the detoxification of cyanide-containing industrial waste.
Describe the chemical hazards associated with improper disposal of fluorescent lamps.
Describe the environmental impact of improper disposal of batteries.
Describe the environmental risks of open dumping of waste.
Describe the main chemical reactions involved in the incineration of municipal solid waste.
Explain the difference between hazardous and non-hazardous waste, giving one example of each.
Explain the importance of pH adjustment in the treatment of industrial wastewater.
A landfill receives 5000 kg of organic waste daily. If 60% of this waste is converted to methane, how much methane is produced per day? (Molar mass of methane = 16 g/mol)
Which of the following is a benefit of recycling metals? (1) Increased mining activities (2) Conservation of energy (3) Increased greenhouse gas emissions (4) Soil contamination
Which of the following is a chemical hazard associated with improper e-waste disposal? (1) Lead contamination (2) Nitrogen fixation (3) Ozone depletion (4) Acid rain
Which of the following is a chemical method for treating hazardous waste? (1) Composting (2) Incineration (3) Landfilling (4) Phytoremediation
Which of the following is a chemical property that makes a waste hazardous? (1) Flammability (2) Color (3) Odor (4) Texture
Fill in the blank: The 3Rs of waste management are Reduce, Reuse, and __________.
Fill in the blank: The chemical formula for methane, a landfill gas, is __________.
Fill in the blank: The main greenhouse gas produced by the decomposition of organic waste in landfills is __________.
Fill in the blank: The process of breaking down biodegradable waste by microorganisms in the absence of oxygen is called __________ digestion.
True or False: All plastics can be recycled using the same process.
True or False: Composting requires the presence of oxygen for effective decomposition.
True or False: Incineration of waste always results in complete destruction of all toxic substances.
True or False: Recycling helps in conserving natural resources and reducing pollution.
