Environmental Chemistry - Result Question 39
The concentration of dissolved oxygen (DO) in cold water can go up to
(2019 Main, 11 Jan I)
(a) $14 ppm$
(b) $10 ppm$
(c) $8 ppm$
(d) $16 ppm$
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Answer:
Correct Answer: 17. (a)
Solution:
Dissolved oxygen (DO) is the oxygen dissolved in water either from atmosphere or by photosynthesis. The lower the concentration of DO in a water sample, the more likely it is to be polluted.
The concentration range of dissolved oxygen (DO) in cold water reaches up to $10 ppm$, but that in normal water (at room temperature) is within $5 ppm$.
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