character: Mr. Black
topic: Oxidation-Reduction Reactions in Water Disinfection
grade: 12
subject: Chemistry
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character: Dr. Green
topic: Chemical Processes in Water Purification
grade: 12
subject: Chemistry
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character: Ms. White
topic: The Role of Chlorine in Water Treatment
grade: 12
subject: Chemistry
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character: Prof. Blue
topic: Electrochemistry and its Industrial Applications
grade: 12
subject: Chemistry
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