BOD is:

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The amount of oxygen required to convert the NO in to NO2 in a certain volume of a sample of water.

The amount of F− ions required to convert, one mole of hydroxyapatite into fluorapatite.

The amount of oxygen required by bacteria to break down the organic matter present in a certain volume of a sample of water.

The amount of oxygen required to break down the non-biodegradable waste.

answer is C.

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Detailed Solution

Biochemical oxygen demand (BOD) is the amount of dissolved Oxygen(DO) needed (i.e. demanded) by aerobic biological organisms to break down organic material present in a given water sample at certain temperature over a specific time period. The BOD value is most commonly expressed in milligrams of oxygen consumed per liter of sample during 5 days of incubation at 20 °C .

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