(A) The concentration of dissolved oxygen $(D.O.)$ in water is a key indicator of water quality.According to environmental standards,water is consider

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(A) The concentration of dissolved oxygen $(D.O.)$ in water is a key indicator of water quality.According to environmental standards,water is considered to be polluted if the $D.O.$ content is less than $5 \ ppm$.If the $D.O.$ value is below $5 \ ppm$,it indicates that the water is not suitable for the survival of aquatic life.

Class 11 Chemistry Environmental Chemistry Environmental Study

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Water is considered to be polluted if the dissolved oxygen $(D.O.)$ content is less than $...$ $ppm$ :

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A
$5$
B
$10$
C
$15$
D
$100$

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Environmental Chemistry

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Match List-$I$ with List-$II$ :

List-$I$ List-$II$

$a$. Biochemical oxygen demand $i$. Oxidising mixture

$b$. Photochemical smog $ii$. Stratospheric cloud

$c$. Classical smog $iii$. Organic matter in water

$d$. Ozone layer depletion $iv$. Reducing mixture

Choose the correct answer from the options given below:

List-$I$	List-$II$
$a$. Biochemical oxygen demand	$i$. Oxidising mixture
$b$. Photochemical smog	$ii$. Stratospheric cloud
$c$. Classical smog	$iii$. Organic matter in water
$d$. Ozone layer depletion	$iv$. Reducing mixture