Tag: air and air pollution

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

Which of the following is a wet deposition of acid rain?

  1. Fog

  2. Rain

  3. Snow

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

Wet deposition is rain, sleet, snow, or fog that has become more acidic than normal. Wet deposition of acids occurs when any form of precipitation removes acids from the atmosphere and delivers it to the Earth's surface.

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

Rain, snow or fog, which is acidic in nature, is known as:

  1. acid rain

  2. acid snow

  3. acid fog

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

Acid rain includes any form of precipitation with acidic components from the atmosphere.

This can include rain, snow, fog, hail or even dust that is acidic.
This happens when oxides of sulphur and nitrogen that are emitted by the industries react with water and oxygen in the atmosphere to form sulphuric acid and nitric acid respectively.
These acids are responsible for the acidic nature of the rains. Their pH is usually between 5.5 to 5.
Thus, 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 gases related with acid rain?

  1. ${ NO } _{ 2 }$ and ${ CO } _{ 2 }$
  2. ${ CH } _{ 4 }$ and ${ SO } _{ 2 }$
  3. ${ CO } _{ 2 }$ and ${ SO } _{ 2 }$
  4. ${ SO } _{ 2 }$ and ${ NO } _{ 2 }$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

${ SO } _{ 2 }$ and ${ NO } _{ 2 }$:burning of fossil fuels releases oxides of sulphur and nitrogen, ${ SO } _{ 2 }$ and ${ NO } _{ 2 }$ reacts with water and oxygen and other chemicals to form sulphuric acid and nitric acid.

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

 Acid rain happens because:

  1. sun leads to heating of upper layer of atmosphere

  2. the burning of fossil fuels release oxides of carbon, nitrogen, and sulphur in the atmosphere

  3. electrical charges are produced due to friction amongst clouds

  4. earth atmosphere contains acids
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

 Acid rain is caused by emissions of acidic gases like sulphur dioxide, nitrogen and carbon oxides, 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

Assertion(A) : Rainwater normally has a $pH$ $= $ 5.6


Reason (R) : This is due to the presence of $H _{2}SO _{4}$ and $HNO _{3}$ produced from oxides of sulphur and nitrogen.

  1. Both A and R are true and R is the correct explanation of A.

  2. Both A and R are true but R is not correct explanation of A.

  3. A is true and R is false.

  4. A is false and R is true
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Normal rain has a pH of about 5.6. This is because it reacts with carbon dioxide in the atmosphere and forms mildly acidic carbonic acid before it becomes rain.

Acid rains occur due to oxides of nitrogen and sulphur.

Nitric acid & sulphuric acid in the atmosphere dissolve in rainwater and come down to earth as acid rain. 

Acid rains have a pH 4.

Therefore, option C is correct

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

Assertion (A): The oxides of nitrogen and sulphur combine with rainwater and come down as acid rain.
Reason (R): Acid rains cause depletion of ozone layer.

  1. Both A and R are true and R is the correct explanation of A

  2. Both A and R are true but R is not correct explanation of A

  3. A is true and R is false

  4. A is false and R is true
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Below are few properties of acid rain:
1) Acid rains are obtained due to oxides of nitrogen & sulphur.
2) Nitric acid and sulphuric acid in the atmosphere dissolve in rain water and come down to earth as acid rain. 
3) It may have a pH less than 5.6
4) There is no relation of acid rain with ozone layer.

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

Which of the following gases will not cause acid rain?

  1. $SO _2$
  2. $NO _2$
  3. $CO _2$
  4. $O _3$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Sulphur present in any fuel combines with oxygen and forms $SO _2$ in the combustion chamber. $SO _2$ when emitted into the atmosphere, it oxidizes to form $SO _3$. It is soluble in water in the clouds and forms $H _2SO _4$ (Sulphuric acid).

$S+O _2 \rightarrow SO _2 +\dfrac {1}{2} O _2 \longrightarrow SO _3+H _2O\rightarrow H _2SO _4$

Most of the $NO _x$ emitted in the form in the forms of $NO$.
This $NO$ oxidised in the atmosphere to form $NO _2$.
$NO _2$ is soluble in water and form $HNO _3$ (Nitric Acid).

$NO+\dfrac {1}{2}O _2\rightarrow NO _2+H _2O\rightarrow HNO _3$ 
                       
Carbon divide reacts with water to form carbonic acid. Carbonic acid then dissociates to give the hydrogen ion $(H^+)$ and the hydrogen carbonate ion $(HCO _3^-)$. The ability of $H _2CO _3$ to deliver $H^+$ classifies this molecule as acid.

$CO _2 +H _2O\longrightarrow H _2CO _3$

$H _2CO _3 \longrightarrow H^++HCO _3^-$

For $O _3$,
$O _3+$Ultraviolet $\rightarrow O+O _2$

$O+O _3\rightarrow 2O _2$

Net Reaction: $2O _3+ UV\rightarrow 3O _2$

It does from any acidic component therefore $O _3$ will not cause acid rain.