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Magazine Chapter 33: Problem 64
Which of the following statements are true? (1) London smog is oxidizing in nature. (2) London smog is a mixture of smoke and fog. (3) Photochemical smog causes irritation in eyes. (4) Photochemical smog results in the formation of PAN. (a) 1,2 and 3 (b) 1,2 and 4 (c) 2,3 and 4 (d) 1,3 and 4
Short Answer
Expert verified
Option (c) 2, 3, and 4 are true.
Step by step solution
01
Understanding London Smog
London smog, also known as classical smog, is primarily caused by burning coal and is characterized by the presence of sulfur dioxide, smoke, and fog. It is known to be reducing in nature, not oxidizing.
02
Evaluating Statement 1
Statement 1 claims that London smog is oxidizing in nature. From Step 1, we know London smog is reducing, not oxidizing. Therefore, statement 1 is false.
03
Evaluating Statement 2
Statement 2 claims that London smog is a mixture of smoke and fog. From the definition of London smog in Step 1, this is true because it is indeed composed of smoke and fog.
04
Understanding Photochemical Smog
Photochemical smog, unlike London smog, is oxidizing and contains secondary pollutants like ozone, nitrogen oxides, and peroxyacetyl nitrate (PAN). It is known to cause eye irritation.
05
Evaluating Statement 3
Statement 3 claims that photochemical smog causes irritation in eyes. Based on Step 4, this is true because the pollutants in photochemical smog are known to irritate the eyes.
06
Evaluating Statement 4
Statement 4 claims that photochemical smog results in the formation of PAN. From Step 4, we see that PAN is a component of photochemical smog, so this statement is true.
07
Finding the True Statements Combination
From our evaluations: Statement 2 is true, Statement 3 is true, and Statement 4 is true. Therefore, the correct combination of true statements is 2, 3, and 4.
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
London Smog
London Smog, historically referred to as classical smog, was prevalent in urban areas during the Industrial Revolution. It combines smoke, which includes tiny particles from burning coal, with natural fog. The mixture is particularly dense and posed severe health risks for those exposed, especially in areas with extensive coal use.
This type of smog is characterized as reducing rather than oxidizing. Here's why:
This type of smog is characterized as reducing rather than oxidizing. Here's why:
- Its chemical nature involves reactions that consume oxygen rather than produce it, hence the term 'reducing'.
- Sulfur dioxide (\( SO_2 \)) and soot (tiny carbon particles) contribute heavily to this form of air pollution.
Photochemical Smog
Photochemical smog, unlike its London counterpart, emerges primarily in sunny regions from chemical reactions between sunlight and pollutants such as nitrogen oxides and volatile organic compounds (VOCs).
It features several distinctive characteristics:
It features several distinctive characteristics:
- It is oxidizing in nature, meaning it involves the creation of oxidants such as ozone (\( O_3 \)) in the atmosphere.
- Photochemical smog is notorious for causing adverse health effects, including eye irritation and respiratory problems.
- Produced in urban areas with high vehicle emissions, it often gives the sky a brownish haze that is not only visually unappealing but also harmful.
Pollutants
Pollutants are harmful substances introduced into the environment that cause adverse effects. In the context of environmental chemistry, they are integral to understanding both London and photochemical smog.
A few key points about pollutants:
A few key points about pollutants:
- Primary pollutants, such as sulfur dioxide and nitrogen oxides, are emitted directly from sources like cars and factories.
- Secondary pollutants, like ozone and peroxyacetyl nitrate (PAN), form in the atmosphere through chemical reactions involving primary pollutants.
- These pollutants contribute significantly to air quality issues, impacting human health, ecosystems, and the climate.
Sulfur Dioxide
Sulfur dioxide (\( SO_2 \)) is a significant component of London smog and a notable air pollutant.
Here are some key aspects:
Here are some key aspects:
- It usually comes from the burning of fossil fuels, especially coal, and some industrial processes.
- In the atmosphere, it can lead to acid rain, which harms ecosystems and structures.
- \( SO_2 \) contributes to respiratory issues in humans, aggravating conditions like asthma.
Peroxyacetyl Nitrate (PAN)
Peroxyacetyl nitrate (PAN) is a crucial secondary pollutant found in photochemical smog.
Here are essential details about PAN:
Here are essential details about PAN:
- It forms in the atmosphere through reactions between nitrogen oxides and organic compounds in the presence of sunlight.
- PAN causes irritation to respiratory systems and eyes, contributing to what is commonly known as smog-induced discomfort.
- Because it can travel long distances, PAN affects areas far from its source, making it a significant concern for regional air quality.
