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Q)

Which one of the following is not true ?

$\begin{array}{1 1} \text{(a) Concentration of DO below 6 ppm is good for the growth of fish} \\\text{(b) Clean water would have a BOD value of less than 5 ppm} \\ \text{(c) Oxides of sulphur , nitrogen and carbon are the most widespread air } \\\text {(d) pH drinking water should be 5.5-9.5}\end{array} $

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A)
Solution :
(a) Concentration of DO below 6 ppm is good for the growth of fish
The growth of fish is inhibited if the concentration of DO is below 6
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