(C) The correct option is $C$.It is beneficial because the ozone layer in the stratosphere absorbs harmful ultraviolet $(UV)$ radiation from the sun.T

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It is beneficial because ozone filters out the ultraviolet radiation from the sun.

(C) The correct option is $C$.It is beneficial because the ozone layer in the stratosphere absorbs harmful ultraviolet $(UV)$ radiation from the sun.This protection prevents $UV$ rays from reaching the Earth's surface,which would otherwise cause skin cancer,cataracts,and damage to ecosystems.

Class 11 Chemistry Environmental Chemistry Environmental Study

Medium

Which of the following statements is true about the ozone layer?

A
It is harmful because ozone is dangerous to living organisms.
B
It is beneficial because oxidation reactions can proceed faster in the presence of ozone.
C
It is beneficial because ozone filters out the ultraviolet radiation from the sun.
D
It is harmful because ozone cuts out important solar radiation that is vital for photosynthesis.

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Class 11

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Chapter

Environmental Chemistry

Subtopic

Environmental Study

Mention the components of photochemical smog and its effects.

Medium

View Solution

Match the following:

List-$I$ (Pollutant concentration limit in water) List-$II$ (Effect)

$A. Pb > 50 \ ppb$ $I. \text{Liver damage}$

$B. SO_4^{2-} > 500 \ ppm$ $II. \text{Laxative effect}$

$C. NO_3^{-} > 50 \ ppm$ $III. \text{Blue baby syndrome}$

$D. F^{-} > 2 \ ppm$ $IV. \text{Brown mottling of teeth}$

The correct answer is

List-$I$ (Pollutant concentration limit in water)	List-$II$ (Effect)
$A. Pb > 50 \ ppb$	$I. \text{Liver damage}$
$B. SO_4^{2-} > 500 \ ppm$	$II. \text{Laxative effect}$
$C. NO_3^{-} > 50 \ ppm$	$III. \text{Blue baby syndrome}$
$D. F^{-} > 2 \ ppm$	$IV. \text{Brown mottling of teeth}$