Waec Model Questions Vol1 2022 Chemistry Question 42
Practice objective / multiple choice question 42 from the 2022 Waec Model Questions Vol1 Chemistry examination.
A wastewater sample is tested for BOD₅. The sample is diluted 1:3 (one part sample to two parts distilled water) and the dissolved‑oxygen (DO) drop after 5 days at 20 °C is 1.5 mg L⁻¹. The saturation DO at 20 °C is 9.0 mg L⁻¹. Using a temperature‑correction factor θ = 1.047, calculate the BOD₅ of the undiluted sample at 25 °C and state whether it meets the regulatory limit of 5 mg L⁻¹.
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About This Question
This is Waec Model Questions Vol1 2022 Chemistry Question 42. It is one of the objective questions from the 2022 Waec Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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