Gce Model Questions Vol1 2020 Chemistry Question 17
Practice objective / multiple choice question 17 from the 2020 Gce Model Questions Vol1 Chemistry examination.
A lake of volume \(5.0 \times 10^{6}\) L receives a continuous inflow of clean water at \(200\) L s\(^{-1}\) and has an equal outflow. The lake initially contains a dissolved pollutant at a concentration of \(10\) mg L\(^{-1}\). The pollutant undergoes first‑order decay with rate constant \(k = 0.001\) s\(^{-1}\). Assuming perfect mixing, determine the time required for the pollutant concentration to fall to \(2\) mg L\(^{-1}\). Give your answer in seconds to three significant figures.
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About This Question
This is Gce Model Questions Vol1 2020 Chemistry Question 17. It is one of the objective questions from the 2020 Gce Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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