Class 11 Chemistry Environmental Chemistry Environmental Study

Difficult

$A$ water sample is reported to be highly polluted if the $BOD$ (Biological Oxygen Demand) value of the sample becomes:

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A
more than $17 \ ppm$
B
equal to $10 \ ppm$
C
equal to $5 \ ppm$
D
less than $5 \ ppm$

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Class 11

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Environmental Chemistry

Subtopic

Environmental Study

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