The amount of oxygen required to oxidise organic substances present in water is called:

Dissolved oxygen (DO)

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Chemical oxygen demand (COD)

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Biochemical oxygen demand (BOD)

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The threshold limit value (TLV)

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Solution

The correct option is B Chemical oxygen demand (COD)
COD is the chemical oxygen demand. The amount of oxygen required to oxidise organic substances present in polluted water is called chemical oxygen demand (COD). It is an index for the amount of organic substances present in water. It is expressed in milligrams per litre (mg/L), also referred to as ppm (parts per million).

The amount of oxygen used by suitable microorganisms present in water for five days at $20^{o} C$ is called biochemical oxygen demand (BOD).

Hence, the correct option is $B$ .

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Similar questions

The amount of O₂ required by bacteria in water to breakdown wastes into simple inorganic substances is called

Q32 Consider the following statements,

i) The chemical oxygen demand (COD) test is commonly used to indirectly measure the amount of organic compounds in water.

ii) Biochemical oxygen demand is the amount of dissolved oxygen needed by aerobic biological organisms to break down organic material present in a given water sample at certain temperature over a specific time period.

Which of the above statements is/are correct?

Q. Biochemical Oxygen Demand (BOD) is the amount of oxygen required (in ppm):

10

mL of water required

1.47

mg of

K_{2} C r_{2} O_{7}

(mol. wt.

= 294

) for oxidation of dissolved organic matter. C.O.D (Chemical Oxygen Demand) of water is?

Q. The correct match is:

	List - I		List - II
A.	TLV	1.	Oxygen required to oxidise organic substance present in polluted water.
B.	COD	2.	Oxygen used by microorganisms present in water for 5 days
C.	DO	3.	$O_{2}$ present in water is in dissolved state.
D.	BOD	4.	Permissible level of pollutant that can be present in a mine.
		5.	$O_{2}$ that is present in atmosphere.

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