'Ozone layer' absorbing ultraviolet radiation exists in which of the atmospheric layer? 

The correct answer is Stratosphere.

Key PointsOzone layer

• The ozone layer is a natural layer of gas in the upper atmosphere that protects humans and other living things from harmful ultraviolet (UV) radiation from the sun.
• The ozone layer exists in the stratosphere, a layer 10 to 50 km above the Earth’s surface.
• The international community established the Montreal Protocol on ozone-depleting substances in 1987, to address the destruction of the ozone layer.
• The stratospheric ozone layer absorbs ultraviolet (UV) radiation, preventing dangerous UV rays from hitting the Earth's surface and harming living organisms.
• It contains a high concentration of ozone (O₃) in relation to other parts of the atmosphere.
• The ozone layer in the stratosphere is affected by the increase in the atmospheric concentration of CFC (chlorofluorocarbons).
• In the atmosphere, CFCs drift slowly upward to the stratosphere, where they are broken up by ultraviolet radiation, releasing chlorine atoms, which can destroy ozone molecules.
• CFCs are the main reason for the Ozone hole.
• The other reasons for ozone depletion are a wide range of industrial and consumer applications, mainly refrigerators, air conditioners (hydrochlorofluorocarbons (HCFCs), and fire extinguishers.