Question

Ultraviolet radiations from sunlight causes a reaction that produce
A. Fluorides
B. Carbon monoxide
C. Sulphur dioxide
D. Ozone

Answer 1

Hint: UV rays are the electromagnetic rays of wavelength around 10nm to 400nm. It constitutes around 10% of the total electromagnetic output from the sun.

Complete step by step answer:
To solve the question we must know about the ultra violet radiations and its reactions.
Sunlight is the main source of UV rays. There are three types of ultraviolet radiations- UVA, UVB and UVC. UVC is the most harmful rays absorbed by the atmosphere. UVB can cause sun burns and can cause the risk of DNA damage. Maximum of UVB is absorbed by the ozone layer. UVA is also called the black light.
Atmosphere is composed of many gases like nitrogen (78%), oxygen (21%), carbon dioxide(0.33%) and miscellaneous (1%). In the atmosphere, the ultraviolet rays cause photochemical splitting. It breaks the atmospheric oxygen to form 2[O]. This nascent [O] undergoes collision with other oxygen molecules to form two ozone molecules.
 

Ozone layer is created in the stratosphere. It prevents harmful UVC from entering into the earth’s atmosphere.
Carbon monoxide, sulphur dioxides are the harmful gases released as a result of combustion of fuels.
Fluoride occurs naturally in the atmosphere.

Thus the correct answer is D. Ozone is formed by the reaction of UV rays.

Note:
Ozone is created by the UV rays in the stratosphere. This ozone layer prevents the harmful radiation from the sun from entering into earth’s atmosphere. Due to pollutants like fluorides, this layer is depleting at a fast rate.