Which of the following indications of the health of a water body is the most widely accepted means of measuring how polluting and effluent is?

COD(chemical oxygen demand)

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BOD (biological oxygen demand)

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Chloroform content

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None of these

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Solution

The correct option is B BOD (biological oxygen demand)
BOD is a chemical procedure for determining the amount of dissolved $O_{2}$ , needed by aerobic biological organisms in a body of water to break down organic material present in a given water sample at a certain temperature over a specific time period.

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