A. Exposure of a body of water ultraviolet rays
B. Discharge of industrial effluents into waterways
C. Passage of river water through a send bed
D. Addition of a measured quantity of chlorine to water
Correct Answer: Option B
B. Discharge of industrial effluents into waterways
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![A quantity of hot water at 100ºC is added to 400g of water at 10ºC until the temperature of the mixture is 60ºC. Calculate the mass of the hot water added. [Specific heat capacity of water =4200JKg-1 K-1]](https://erudites.ng/wp-content/plugins/contextual-related-posts/default.png "A quantity of hot water at 100ºC is added to 400g of water at 10ºC until the temperature of the mixture is 60ºC. Calculate the mass of the hot water added. [Specific heat capacity of water =4200JKg-1 K-1]")