Neco Model Questions Vol1 2021 Chemistry Question 36
Practice objective / multiple choice question 36 from the 2021 Neco Model Questions Vol1 Chemistry examination.
A river receives wastewater containing a pollutant that undergoes first‑order decay. During daylight (12 h) the decay constant is \(k_1\) day\(^{-1}\) (photolysis active) and during night (12 h) it is \(k_2 = 0.02\) day\(^{-1}\). At the start of the first daylight period the pollutant concentration is \(C_0 = 50\) mg L\(^{-1}\). After three full days (72 h) the measured concentration is \(C = 20\) mg L\(^{-1}\). Assuming the decay pattern repeats every day, calculate the daylight decay constant \(k_1\) (in day\(^{-1}\), give your answer to two decimal places).
Answer Options
About This Question
This is Neco Model Questions Vol1 2021 Chemistry Question 36. It is one of the objective questions from the 2021 Neco Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
Master the Exam!
You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.