Neco Model Questions Vol1 2018 Chemistry Question 41
Practice objective / multiple choice question 41 from the 2018 Neco Model Questions Vol1 Chemistry examination.
A lake of volume (2.0\times10^{6}\) m\(^3\) receives a continuous inflow of wastewater at a rate of 5000 m\(^3\)/day containing nitrate ion \(\text{NO}_3^-\) at a concentration of 80 mg/L. The lake also has an outflow equal to the inflow, so its volume remains constant. Nitrate undergoes first‑order denitrification in the lake with a half‑life of 30 days. Determine the steady‑state concentration of nitrate in the lake water and state whether this concentration exceeds the NECO permissible limit of 10 mg/L for drinking water.
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About This Question
This is Neco Model Questions Vol1 2018 Chemistry Question 41. It is one of the objective questions from the 2018 Neco Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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