Question

Biological Oxygen Demand $$\left( {BOD} \right)$$  can be defined as,

A. the amount of oxygen required by bacteria to break down the organic matter of a sample of water  
B. the amount of chemicals required to break down the organic matter of a sample of water
C. the amount of phosphate required to oxidise the organic matter of a sample of water
D. the amount of organic matter present in the given sample of water
Answer :   the amount of oxygen required by bacteria to break down the organic matter of a sample of water
Solution :
The amount of $$BOD$$  in water is the measure of the amount of organic matter in water in terms of how much oxygen is required to break it down biologically.

Releted MCQ Question on
Inorganic Chemistry >> Environmental Chemistry

Releted Question 1

Which of the following statement is false ?

A. London smog is oxidising in nature
B. Photochemical smog causes irritation in eyes
C. London smog is a mixture of smoke and fog
D. Photochemical smog results in the formation of $$PAN$$
Releted Question 2

Which of the following acts as a sink for $$CO?$$

A. Plants
B. Haemoglobin
C. Microorganisms present in the soil
D. Oceans
Releted Question 3

Global warming is due to increase of :

A. methane and nitrous oxide in atmosphere.
B. methane and $$C{O_2}$$  in atmosphere.
C. methane and $${O_3}$$  in atmosphere.
D. methane and $$CO$$  in atmosphere.
Releted Question 4

Which of the following statements about the depletion of ozone layer is correct ?

A. The problem of ozone depletion is less serious at poles because $$N{O_2}$$  solidifies and is not available for consuming $$CI{O^ \bullet }$$  radicals.
B. The problem of ozone depletion is more serious at poles because ice crystals in the clouds over poles act as catalyst for photochemical reactions involving the decomposition of ozone of $$C{l^ \bullet }$$  and $$CI{O^ \bullet }$$  radicals.
C. Freons, chlorofluorocarbons, are inert. Chemically, they do not react with ozone in stratosphere.
D. Oxides of nitrogen also do not react with ozone in stratosphere.

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Environmental Chemistry


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