Question:
Which of the following statements are correct with reference to Photochemical Smog?
A. It is an oxidizing smog.
B. It is formed by the reaction between NO\(_2\) and hydrocarbons.
C. It is a reducing smog.
D. It is formed in the presence of UV-radiation.
Choose the most appropriate answer from the options given below:
Which of the following statements are correct with reference to Photochemical Smog?
A. It is an oxidizing smog.
B. It is formed by the reaction between NO\(_2\) and hydrocarbons.
C. It is a reducing smog.
D. It is formed in the presence of UV-radiation.
Choose the most appropriate answer from the options given below:
A. It is an oxidizing smog.
B. It is formed by the reaction between NO\(_2\) and hydrocarbons.
C. It is a reducing smog.
D. It is formed in the presence of UV-radiation.
Choose the most appropriate answer from the options given below:
Show Hint
Break down the name "Photochemical Smog":
\textbf{Photo}: Needs sunlight (UV radiation).
\textbf{Chemical}: Involves chemical reactions of primary pollutants (NOx + VOCs).
\textbf{Smog}: Forms a haze containing secondary pollutants, which are strong \textbf{oxidizing} agents (Ozone). \end{itemize}
\textbf{Photo}: Needs sunlight (UV radiation).
\textbf{Chemical}: Involves chemical reactions of primary pollutants (NOx + VOCs).
\textbf{Smog}: Forms a haze containing secondary pollutants, which are strong \textbf{oxidizing} agents (Ozone). \end{itemize}
Updated On: Sep 20, 2025
- A, B and D only
- A and B only
- C and D only
- B, C and D only
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Photochemical smog, also known as Los Angeles-type smog, is a type of air pollution that is common in modern industrial cities with a large number of automobiles. The question asks for its defining characteristics.
Step 2: Analyzing each statement:
- Statement A: True. Photochemical smog is characterized by high concentrations of oxidizing agents, primarily ozone (O\(_3\)). This makes it an oxidizing smog.
- Statement B: True. The primary pollutants that lead to photochemical smog are nitrogen oxides (NOx, including NO\(_2\)) and volatile organic compounds (VOCs), which are hydrocarbons. These are mainly emitted from vehicle exhaust.
- Statement C: False. This is the opposite of statement A. Reducing smog, also called classical or London-type smog, is characterized by high levels of sulfur dioxide (SO\(_2\)) from burning coal and has a reducing chemical nature.
- Statement D: True. The term "photochemical" indicates that sunlight is required. Ultraviolet (UV) radiation from the sun provides the energy to drive the chemical reactions between NOx and VOCs, leading to the formation of secondary pollutants like ozone.
Step 3: Final Answer:
The correct statements are A, B, and D. Therefore, option (A) is the correct choice.
Photochemical smog, also known as Los Angeles-type smog, is a type of air pollution that is common in modern industrial cities with a large number of automobiles. The question asks for its defining characteristics.
Step 2: Analyzing each statement:
- Statement A: True. Photochemical smog is characterized by high concentrations of oxidizing agents, primarily ozone (O\(_3\)). This makes it an oxidizing smog.
- Statement B: True. The primary pollutants that lead to photochemical smog are nitrogen oxides (NOx, including NO\(_2\)) and volatile organic compounds (VOCs), which are hydrocarbons. These are mainly emitted from vehicle exhaust.
- Statement C: False. This is the opposite of statement A. Reducing smog, also called classical or London-type smog, is characterized by high levels of sulfur dioxide (SO\(_2\)) from burning coal and has a reducing chemical nature.
- Statement D: True. The term "photochemical" indicates that sunlight is required. Ultraviolet (UV) radiation from the sun provides the energy to drive the chemical reactions between NOx and VOCs, leading to the formation of secondary pollutants like ozone.
Step 3: Final Answer:
The correct statements are A, B, and D. Therefore, option (A) is the correct choice.
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