Neco Model Questions Vol1 2017 Chemistry Question 30
Practice objective / multiple choice question 30 from the 2017 Neco Model Questions Vol1 Chemistry examination.
A water sample is diluted by mixing one part of the sample with three parts of distilled water (dilution factor 4). The diluted sample is incubated at 22 °C for 5 days. The initial dissolved‑oxygen (DO) reading is 8.5 mg L\(^{-1}\) and after incubation it is 5.2 mg L\(^{-1}\). A nitrification control shows that 0.30 mg L\(^{-1}\) of oxygen was consumed by nitrification. To correct for the temperature deviation from the standard 20 °C, a factor of 1.05 is applied. Determine the BOD\(_5\) (in mg L\(^{-1}\)) of the original undiluted water sample.
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About This Question
This is Neco Model Questions Vol1 2017 Chemistry Question 30. It is one of the objective questions from the 2017 Neco Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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