Waec Model Questions Vol1 2018 Chemistry Question 6
Practice objective / multiple choice question 6 from the 2018 Waec Model Questions Vol1 Chemistry examination.
A wastewater sample contains 120 mg L⁻¹ of phenol. It is treated in two successive steps: (i) aerobic biodegradation removes 40 % of the phenol present, (ii) an advanced oxidation process (Fenton's reagent) removes 75 % of the phenol remaining after step (i). The treated water is then mixed with clean water in a ratio of 1 part treated water to 3 parts clean water before discharge. What is the final phenol concentration in the discharged water (in mg L⁻¹)? Give your answer to two decimal places.
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About This Question
This is Waec Model Questions Vol1 2018 Chemistry Question 6. It is one of the objective questions from the 2018 Waec Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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