(B) The amount of oxygen required by bacteria to break down the organic matter present in a certain volume of a sample of water is called biochemical

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(B) The amount of oxygen required by bacteria to break down the organic matter present in a certain volume of a sample of water is called biochemical oxygen demand $(BOD)$.The amount of $BOD$ in the water is a measure of the amount of organic material in water in terms of how much oxygen will be required to break it down biologically.Clean water has a $BOD$ value of less than $5 \ ppm$,whereas highly polluted water,such as municipal sewage,has a $BOD$ value of more than $100 \ ppm$.

Class 11 Chemistry Environmental Chemistry Environmental Study

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In municipal sewage,$BOD$ values (in $ppm$) are

TS EAMCET 2015 All TS EAMCET

A
$1-5$
B
$100-4000$
C
$50-90$
D
$20-40$

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List-$I$ List-$II$

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List-$I$	List-$II$
$(A)$ Burning sulfur-containing waste releases gases into the atmosphere.	$(1)$ Water pollution
$(B)$ Use of carbonates as pesticides	$(2)$ Photochemical smog,damage to plant life,corrosion of buildings,respiratory problems,water pollution.
$(C)$ Using synthetic detergents for washing clothes	$(3)$ Damage to the ozone layer
$(D)$ Releasing smoke from vehicles and factories into the atmosphere.	$(4)$ Neurological disorders in humans.
$(E)$ Using chlorofluorocarbon compounds to clean computer parts.	$(5)$ Classical smog,acid rain,water pollution,respiratory problems,damage to buildings,metal corrosion.

In municipal sewage,$BOD$ values (in $ppm$) are

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