The relative stability of a sewage sample, whose dissolved oxygen is same as the total oxygen required to satisfy BOD, is
A. 1
B. 100
C. Infinite
D. Zero
Answer: Option B
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Relative stability:
The ratio of oxygen available in the wastewater (as dissolved oxygen) to the total oxygen required to satisfy its first state BOD is called relative stability.
Oxygen available/oxygen reqd x 100
Bcoz it is defined as percentage of oxygen required to satisfy 1st stage BOD.
Why should not1