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

Acid rain is caused by emissions of:

  1. sulphur dioxide

  2. nitrogen dioxide
  3. both $A$ and $B$

  4. hydrogen
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Acid rain is a rain or any other form of precipitation that is unusually acidic, meaning that it possesses elevated levels of hydrogen ions (low pH). It can have harmful effects on plants, aquatic animals and infrastructure. Acid rain is caused by emissions of sulfur dioxide and nitrogen oxide, which react with the water molecules in the atmosphere to produce acids. 

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

Over a number of years the average pH of a stream changes from a pH of 6.9 to a pH of 5.9 due to acid rain. Which statement is true about the pH of the stream?

  1. The pH of the stream now is one times more acidic than it was years ago

  2. The stream now has 10 times more hydroxide ions than it did years ago

  3. The pH of the stream is now 10 times more acidic than it was years ago

  4. The stream is more basic now than it was years ago

  5. The concentration of hydronium ion in the stream has decreased over the years
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Over a number of years the average pH of a stream changes from a pH of 6.9 to a pH of 5.9 due to acid rain. The pH of the stream is now 10 times more acidic than it was years ago.
Years ago, the pH was 6.9. The present day pH is 5.9. The change in pH is
$\displaystyle  = \Delta pH= 5.9-6.9 = -1$
The corresponding change in hydrogen ion concentration is:
$\displaystyle 10^{-\Delta pH}= 10^{-(-1)} = 10$

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

Which of the following is a major natural cause for acid rain?

  1. Earthquakes

  2. Cyclones

  3. Volcanoes

  4. Thunderstorm
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The major natural causal agent for acid rain is volcanic emissions. Volcanoes emit acid producing gases to create higher than normal amounts of acid rain or any other form of precipitation such as fog and snow to an extent of affecting vegetation cover and health of residents within the surrounding. 

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

In the gases below, which would react with rain water to produce acid rain?
i. CFCs
ii. Methane
iii. Carbon dioxide

  1. i only

  2. ii only

  3. iii only

  4. i and iii only

  5. i, ii and iii
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Carbon dioxide would react with rainwater to produce acid rain.


The reaction of carbon dioxide with water gives carbonic acid.

$\displaystyle CO _2 + H _2O \rightarrow H _2CO _3 $

  • Hence the correct option is C.

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

Which is among the greatest contributors to gaseous pollutions that are responsible for acidic rain?

  1. Electrical power generation using coal

  2. Earthquakes

  3. Air pollution

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

The principal cause of acid rain is sulfur and nitrogen compounds from human sources, such as electricity generation, factories, and motor vehicles. Electrical power generation using coal is among the greatest contributors to gaseous pollutions that are responsible for acidic rain. The gases can be carried hundreds of kilometers in the atmosphere before they are converted to acids and deposited.

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

Photochemical smog is the chemical reaction of sunlight, nitrogen oxides and volatile ________ compounds in the atmosphere, which leaves airborne particles and ground-level ozone.

  1. hydrocarbons

  2. inorganic compounds

  3. sulphates

  4. carbonates
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Photochemical smog is the chemical reaction of sunlight, nitrogen oxides and volatile organic compounds in the atmosphere, which leaves airborne particles and ground-level ozone.
Hence option A is the correct answer.

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

What is so important about the troposphere?

  1. Layer of water at or near Earths surface

  2. Contains ozone

  3. It contains weather and the oxygen that we breath

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

The troposphere is the lowest portion of earth's atmosphere and is also where all weather takes place. It contains approximately 75% of the atmosphere's mass and 99% of its water vapour and aerosols.