Understanding Ozone: Structure and Location in the Atmosphere

Let's examine the two statements provided regarding Ozone to determine their accuracy and the relationship between them.

Analysis of Statement I: Ozone is a triatomic molecule of oxygen.

Statement I discusses the chemical structure of ozone. Ozone is indeed a molecule composed of three oxygen atoms chemically bonded together. Its chemical formula is \( \text{O}_3 \). A molecule made of three atoms is referred to as a triatomic molecule.

• Ozone is represented by the chemical formula \( \text{O}_3 \).
• It consists of three oxygen atoms.
• Therefore, ozone is correctly described as a triatomic molecule of oxygen.

Based on its chemical composition and structure, Statement I is true.

Analysis of Statement II: Ozone is concentrated mainly in the stratosphere.

Statement II talks about the primary location of ozone in the Earth's atmosphere. Ozone is present throughout the atmosphere, but approximately 90% of atmospheric ozone is found in the stratosphere, forming what is commonly known as the ozone layer. This layer is located between about 10 to 50 kilometers above the Earth's surface, though concentrations vary with altitude and latitude.

• Ozone is distributed in the atmosphere.
• The highest concentration of ozone is found in the stratosphere.
• This stratospheric ozone forms the protective ozone layer.

Based on the distribution of ozone in the atmosphere, Statement II is true.

Examining the Relationship Between the Statements

Now we need to determine if Statement II is the correct explanation for Statement I. Statement I describes the molecular structure of ozone (it's triatomic). Statement II describes where ozone is primarily located (in the stratosphere). The fact that ozone is a triatomic molecule (its structure) does not cause it to be located in the stratosphere, nor does its location in the stratosphere explain why it is made of three oxygen atoms.

• Statement I defines what ozone is chemically (\( \text{O}_3 \)).
• Statement II states where ozone is mainly found.
• The location of a substance in the atmosphere does not explain its molecular structure.

Therefore, while both statements are individually true, Statement II is not the correct explanation for Statement I.

Conclusion

Based on our analysis:

• Statement I: Ozone is a triatomic molecule of oxygen (True).
• Statement II: Ozone is concentrated mainly in the stratosphere (True).
• Statement II does not explain Statement I.

This aligns with the option that states both statements are individually true but Statement II is not the correct explanation of Statement I.

Revision Table: Key Facts about Ozone

Additional Information: Importance of Stratospheric Ozone

The concentration of ozone in the stratosphere, forming the ozone layer, is crucial for life on Earth. This layer acts as a natural shield, absorbing a significant portion of the Sun's high-energy ultraviolet (UV) radiation, particularly UV-B and UV-C rays. Exposure to high levels of UV radiation can cause harm to living organisms, including skin cancer, cataracts, and damage to plant life and marine ecosystems.

Ozone is continuously being created and destroyed in the stratosphere through natural processes involving UV radiation and oxygen molecules (\( \text{O}_2 \)). Human activities, however, have released certain chemicals, such as chlorofluorocarbons (CFCs) and halons, that can accelerate ozone destruction, leading to thinning of the ozone layer, famously observed as the "ozone hole" over Antarctica. International efforts, like the Montreal Protocol, have successfully reduced the production and consumption of these ozone-depleting substances, allowing the ozone layer to gradually recover.