Tag: air and air pollution

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Questions Related to air and air pollution

Multiple choice chemistry planet earth acid deposition air and air pollution natural resources- air, water and land

Which oxides cause acid rains?

  1. Sulphur dioxide

  2. Nitrogen oxide

  3. Carbon dioxide

  4. Both A and B
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Air pollution from burning of fossil fuels is the major cause of acid rain. The main chemicals in air pollution that create acid rain are sulfur dioxide ($SO _2$) and nitrogen oxides. Acid rain usually forms high in the clouds where sulfur dioxide and nitrogen oxides react with water, oxygen, and oxidants. this mixture forms a mild solution of sulfuric acid and nitric acid. Sunlight increases the rate of most of these reactions. Rainwater, snow, fog, and other forms of precipitation containing those mild solutions of sulfuric and nitric acids fall to earth as acid rain.

Multiple choice chemistry planet earth acid deposition air and air pollution natural resources- air, water and land

Sulphur dioxide gas can cause acid rain.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The main chemicals in air pollution that create acid rain are $SO _2$ and $NO _x$. 

Acid rain usually forms high in the clouds, where sulphur dioxide and nitrogen oxides react with water, oxygen, and oxidants this mixture forms a mild solution of sulphuric acid and nitric acid.

Multiple choice chemistry planet earth acid deposition air and air pollution natural resources- air, water and land

Which of the following is/are damages caused by acid rain?

  1. It depletes the soil of nutrients, increases the acidity of the soil and reduces fertility.

  2. It destroys marine life due to change in pH of the environment.

  3. It causes material damage.

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The damages caused by acid rain are:

  1. It depletes the soil of nutrients, increases the acidity of the soil and reduces fertility, as the ideal conditions for the growth of trees are lost. 
  2. It destroys marine life due to change in pH of the environment, making it unfit for habitation by aquatic animals.
  3. It causes material damage such as corrosion of marbles. 

Multiple choice chemistry planet earth acid deposition air and air pollution natural resources- air, water and land

Which of the following reactions is not correct for the formation of acid rain?

  1. $\displaystyle { N } _{ 2 }+{ O } _{ 2 }\rightarrow 2NO$
  2. $\displaystyle 2NO+{ O } _{ 2 }\rightarrow { 2NO } _{ 2 }$
  3. $\displaystyle { H } _{ 2 }O+2{ NO } _{ 2 }\rightarrow { HNO } _{ 2 }+{ HNO } _{ 3 }$
  4. $\displaystyle NO+{ O } _{ 2 }\rightarrow { NO } _{ 2 }$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

$\displaystyle NO+{ O } _{ 2 }\rightarrow { NO } _{ 2 }$ is the incorrect equation as it is not balanced. 

Multiple choice chemistry planet earth acid deposition air and air pollution natural resources- air, water and land

What is the pH of acid rain?

  1. 5.8

  2. 5.5

  3. 4.2

  4. 3.8
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Normal, clean rain has a pH value of between 5.0 and 5.5, which is slightly acidic. However, when rain combines with sulfur dioxide or nitrogen oxides—produced from power plants and automobiles—the rain becomes much more acidic. Typical acid rain has a pH value of 4.0.
 A decrease in pH values from 5.0 to 4.0 means that the acidity is 10 times greater.
Multiple choice chemistry planet earth acid deposition air and air pollution natural resources- air, water and land

Suspended particulate matter like __________ emitted from industries causes yellowing of marble.

  1. dust particles

  2. acidic gases

  3. soot particles

  4. all of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Industries like Mathura Oil refinery near Agra emits certain suspended particulate matter like soot particles. This results in yellowing of marble of the monument.

Multiple choice chemistry planet earth acid deposition air and air pollution natural resources- air, water and land

Which of the following is correct about acid rain?

  1. Rain which is acidic in nature

  2. Rain which is basic in nature

  3. Rain which is neutral in nature

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When oxides of sulphur and nitrogen which are emitted by the industries, react with the moisture present in the atmosphere, they form acids.

Thus, these acids reduce the pH of the rain falling on the Earth and hence acid rain is acidic in nature.
It's pH acid  rain is 5.5
Hence, the correct answer is option (A).

Multiple choice chemistry planet earth acid deposition air and air pollution natural resources- air, water and land

Which of the following statements is true about acid rain? 

  1. Acid rain will erode marble statues

  2. Acid rain can change the pH of lakes and streams

  3. Acid rain can be formed from carbon dioxide

  4. Acid rain creates holes in the ozone layer

  5. All of the above
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Acid rain is caused due to oxides of nitrogen and sulphur reacting with water, oxygen, carbon dioxide, and other chemicals present high in the atmosphere resulting into acidic pollutants.

As a result of this, $pH$ of rainwater lowers down to $5$ resulting in $pH$ change of lakes and streams.
It also reacts with calcium carbonate present in the marbles causing weathering. 
The oxides of sulphur may also react with $O _3$ present in ozone, thus depleting the ozone layer. Hence all the given statements are correct