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  4. For the ‘greenhouse effect’ consider statements I to III. <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/chemistry/13b482cb67d92b8a740aec813909ce9a-.png /> (I) Sunlight is received by Earth. Some incoming radiations are reflected back into space by the atmosphere and some is absorbed such as certain UV light by stratosphere ozone (II) Earth’s surface emits IR radiations. (III) Emitted IR radiations are less intense than that emitted by Earth’s surface. CO2 along with IR radiations warm the atmosphere. Select the correct statements.

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Q. For the ‘greenhouse effect’ consider statements I to III.
image
(I) Sunlight is received by Earth. Some incoming radiations are reflected back into space by the atmosphere and some is absorbed such as certain $UV$ light by stratosphere ozone
(II) Earth’s surface emits $IR$ radiations.
(III) Emitted $IR$ radiations are less intense than that emitted by Earth’s surface. $CO_2$ along with $IR$ radiations warm the atmosphere.
Select the correct statements.

Environmental Chemistry

Solution:

$CO_2\left(g\right)$ is not assumed to be an air pollutant because it is non-toxic. However, a buildup of $CO_2\left(g\right)$ in the atmosphere may disturb energy balance on earth. Its atmosphere is transparent to visible and $UV$ radiation form the Sun. Infrared radiation is absorbed at earth’s surface and warms it. But some of this absorbed energy is reradiated as $IR$ radiation. Certain atmospheric gases as $CO_2$ and water vapour absorb these IR radiations. Energy retained in the atmosphere produces a warming effect. Thus, thermal energy is retained in a greenhouse-greenhouse effect