Tag: air and air pollution

Questions Related to air and air pollution

Acid rains are produced by:

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

  1. excess ${NO} _{2}$ and ${SO} _{2}$ from burning fossil fuels

  2. excess production of ${NH} _{3}$ by industry and coal gas

  3. excess release of carbon monoxide by incomplete combustion

  4. excess formation of ${CO} _{2}$ by combustion and animal respiration

Show answer
Correct Option: A

Temperature of troposphere decreases with altitude. This is because of_____.

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

  1. high pressure of air

  2. gases present in air

  3. low density of air

  4. all of these

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Correct Option: A
Explanation:
Generally, temperatures decrease with increasing height because the atmosphere distributes itself according to gravity.

In the troposphere, the temperature generally decreases with altitude. The reason is the troposphere's gases absorb very little of the incoming solar radiation. Instead, the ground absorbs this radiation and then heats the tropospheric air by conduction and convection.

Which of the folowing oxides of nitrogen is not a common air pollutant ?

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

  1. $ NO _2$

  2. $ N _2O $

  3. $ NO $

  4. $ N _2O _5 $

Show answer
Correct Option: D
The production of dihydrogen gas via water gas shift reaction,
 
$CO(g) + H _2O (g) \xrightarrow {\Delta/Catalyst} CO _2(g) + H _2(g).$

The $CO _2$ gas is removed by scrubbing with solution of 
chemistry planet earth acid deposition air and air pollution natural resources- air, water and land

  1. sodium arsenite

  2. calcium oxide

  3. sodium phosphate

  4. aluminium oxide

Show answer
Correct Option: A
Explanation:

The water-gas shift reaction (WGSR) describes  the reaction of carbon monoxide and water vapour to form carbon dioxide and hydrogen (the mixture of carbon monoxide and hydrogen is known as water gas)

$CO(g) + H _2O (g) \xrightarrow {\Delta/FeCrO _4} CO _2(g) + H _2(g).$

The carbondioxide obtained in the above reaction is removed by scrubbing with solution of sodium arsenite.

Which of the following are responsible for causing acid-rain?

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

  1. Oxides of sulphur and carbon dioxide.

  2. Oxides of nitrogen and carbon monoxide.

  3. Hydrogen sulphide and carbon dioxide.

  4. Oxides of sulphur and nitrogen.

Show answer
Correct Option: D
Explanation:

Acid rain caused by emissions of sulphur dioxide and nitrogen oxide, which react with water molecules in the  atmosphere to produce corresponding acids.


Oxides of sulphur + water $\rightarrow$ Sulphuric acid

Oxides of Nitrogen + water $\rightarrow$ Nitric acid

Option D is correct.

Low visibility in cold weather is due to:

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

  1. formation of fossil fuel

  2. unburnt carbon particles or hydrocarbons suspended in air

  3. lack of adequate power supply

  4. none of these

Show answer
Correct Option: B
Explanation:

Smog is a dark brown or greyish smoky mist that occurs in cold weather. It is formed by unburnt carbon particles or hydrocarbons suspended in the air. It is a visible indication of air pollution. Smog not only reduces visibility but is highly suffocating and harmful to human beings, animals and plants.


Hence, the correct option is $B$

Acid rain is caused by:

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

  1. deforestation

  2. $CO _2$

  3. $CO$

  4. oxides of sulphur and nitrogen

Show answer
Correct Option: D
Explanation:

Acid rain is caused by oxides of sulphur and nitrogen. 
The sulphur dioxide gas released during burning of coal and oxides of nitrogen released during combustion of petrol dissolve in rain water and form acids such as sulphuric acid and nitric acid. these acids drop down with rain which makes rain acidic.

Acid rain occurs when sulfur dioxide and nitrogen oxides combine with water vapors in the atmosphere and fall as rain. Which of the following is not caused by acid rain?

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

  1. Decreased quality of air

  2. Reduced growth of forests

  3. Reduced pH of water bodies

  4. Destruction of marble buildings

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Correct Option: A
Explanation:
Acid rain does not pollute air rather acid rain is caused de to the air pollution. The air pollutants consisting $SO _2$ and $NO _x$, they combine with the water vapour. 

$SO _2+O _2+H _2O\longrightarrow H _2SO _4$

$NO +H _2O\longrightarrow HNO _2$

$NO _2+H _2O\longrightarrow HNO _3$

Due to the formation of these acids, the rain is acidic. 

Silk and woolen clothes are often damaged by

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

  1. Flies

  2. Insects

  3. Bacteria

  4. Animals

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Correct Option: B
Explanation:

Because insects have the ability to digest silk and wool. Examples of insects that damage the clothes are-silverfish, cockroach, moth etc. 

Acid precipitation is now regarded as a serious problem in some European and Asian countries. Its major cause or source is:

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

  1. the discharge of acidic effluents onto neutral or slightly alkaline land where the acidic components precipitate.

  2. emission of sulfur oxides and nitrogen oxides from thermal power plants and burning of fossil fuels. These oxides dissolve in atmospheric water vapor and fall back on earth as acid rain.

  3. natural carbon dioxide released during respiration of living organisms dissolves in water, forming carbonic acid which is the chief contributor to acidity in rainwater.

  4. none of the above

Show answer
Correct Option: B
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 or low pH. it can have harmful effects on plants, aquatic animals, and infrastructure. It is a result of air pollution. When oxides of sulfur or nitrogen react with water sulfuric acid or nitric acid is formed.