Environmental Chemistry - Result Question 17
17. The concentration of dissolved oxygen (DO) in cold water can go upto
(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. (b)
Solution:
17.
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 polluted is the water sample.
The concentration range of dissolved oxygen (DO) in cold water reaches upto $10 ppm$, but that in normal water (at room temperature) is within 5 ppm.
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