Waec Model Questions Vol1 2023 Chemistry Question 49
Practice objective / multiple choice question 49 from the 2023 Waec Model Questions Vol1 Chemistry examination.
A wastewater sample contains 150 mg L⁻¹ of phenol. It is first treated by adsorption on activated carbon that removes 60 % of the phenol, and then the remaining phenol undergoes first‑order biological degradation with a rate constant k = 0.03 min⁻¹ for 45 minutes. What is the phenol concentration (mg L⁻¹) after both treatments?
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About This Question
This is Waec Model Questions Vol1 2023 Chemistry Question 49. It is one of the objective questions from the 2023 Waec Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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