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Q.

Identify the correct statement from the following

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a

NO3->50 ppm causes laxative effect

b

F-<2 ppm causes Brittleness of bones

c

DO > 6 ppm  indicates good quality water

d

Pb > 50 ppm causes Blue baby syndrome

answer is C.

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Detailed Solution

DO < 4 ppm is harmful and kills micro organisms and fish.DO > 6 ppm indicates good quality water.
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