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An Intiative by Sri Chaitanya
a
Clean water would have a BOD value of 5 ppm
b
Fluoride deficiency in drinking water is harmful. Soluble fluoride is often used to bring its concentration upto 1 ppm.
c
When the pH of rain water is higher than 6.5, it is called acid rain.
d
Dissolved Oxygen (DO) in cold water can reach a concentration upto 10 ppm.
answer is C.
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