Assertion : Ozone is destroyed by CFCs in the | vedclass

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Question

(C) The upper stratosphere contains the ozone layer $(O_3)$,which protects the Earth from harmful ultraviolet $(UV)$ radiation from the Sun. $CFCs$ (c

Vedclass · Accepted Answer

Assertion and reason are both correct,and the reason is the correct explanation for the assertion.

Vedclass · Answer

(C) The upper stratosphere contains the ozone layer $(O_3)$,which protects the Earth from harmful ultraviolet $(UV)$ radiation from the Sun. $CFCs$ (chlorofluorocarbons) released into the atmosphere reach the stratosphere,where they undergo photochemical decomposition to release chlorine radicals. These radicals catalyze the destruction of ozone,leading to the formation of ozone holes. Consequently,these ozone holes allow a higher intensity of $UV$ radiation to reach the Earth's surface. Therefore,both statements are correct,and the reason explains the consequence of the phenomenon described in the assertion.

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

Assertion : Ozone is destroyed by $CFCs$ in the upper stratosphere. Reason : Ozone holes increase the amount of $UV$ radiation reaching the earth.

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