Gce Model Questions Vol1 2021 Chemistry Question 28
Practice objective / multiple choice question 28 from the 2021 Gce Model Questions Vol1 Chemistry examination.
A factory discharges effluent at a flow rate of \(2000\ \mathrm{L\,h^{-1}}\) containing nitrate (\(\mathrm{NO_3^-}\)) at \(30\ \mathrm{mg\,L^{-1}}\) into a river that flows at \(5.0\times10^{5}\ \mathrm{L\,h^{-1}}\) with an initial nitrate concentration of \(5\ \mathrm{mg\,L^{-1}}\). Before discharge, a treatment plant reduces the nitrate concentration in the effluent by 60 %. After mixing, the combined water travels downstream for 3 h, during which nitrate decays by first‑order kinetics with a rate constant \(k = 0.02\ \mathrm{h^{-1}}\). Determine the nitrate concentration (in \(\mathrm{mg\,L^{-1}}\)) measured after this travel time.
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About This Question
This is Gce Model Questions Vol1 2021 Chemistry Question 28. It is one of the objective questions from the 2021 Gce Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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