Environmental Chemistry - Result Question 57

####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. (a)

Solution:

  1. 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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