Igcse Model Questions Vol1 2021 Chemistry Question 33
Practice objective / multiple choice question 33 from the 2021 Igcse Model Questions Vol1 Chemistry examination.
A pollutant is discharged into a river with an initial concentration of 80 mg L\(^{-1}\). The pollutant decays by first‑order kinetics with a rate constant \(k = 0.15\ \text{day}^{-1}\). The river water flows at 0.5 km h\(^{-1}\). Determine the concentration of the pollutant 2 km downstream and state whether it exceeds the safe limit of 10 mg L\(^{-1}\). Also calculate how many days are required for the concentration to fall below 5 mg L\(^{-1}\).
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About This Question
This is Igcse Model Questions Vol1 2021 Chemistry Question 33. It is one of the objective questions from the 2021 Igcse Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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