The water having more dissolved \(\mathrm{O_2}\) is :
Show Hint
- boiling water
- water at \(80^\circ\mathrm{C}\)
- polluted water
- water at \(4^\circ\mathrm{C}\)
The Correct Option is D
Solution and Explanation
Boiling water (\(100^\circ\mathrm{C}\)) and water at \(80^\circ\mathrm{C}\) hold very little dissolved \(\mathrm{O_2}\). Polluted water has a high oxygen demand (organic matter is oxidised using the dissolved \(\mathrm{O_2}\)), so it has less dissolved \(\mathrm{O_2}\).
Water at \(4^\circ\mathrm{C}\) is the coldest and clean, so it holds the most dissolved \(\mathrm{O_2}\).
Answer: (4) water at \(4^\circ\mathrm{C}\)
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