Tag: acid deposition

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

  1. sodium arsenite

  2. calcium oxide

  3. sodium phosphate

  4. aluminium oxide
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  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.
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

Low visibility in cold weather is due to:

  1. formation of fossil fuel

  2. unburnt carbon particles or hydrocarbons suspended in air

  3. lack of adequate power supply

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
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 $B$

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

Acid rain is caused by:

  1. deforestation
  2. $CO _2$
  3. $CO$

  4. oxides of sulphur and nitrogen
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

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?

  1. Decreased quality of air

  2. Reduced growth of forests

  3. Reduced pH of water bodies

  4. Destruction of marble buildings
Reveal answer Fill a bubble to check yourself
A Correct answer
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. 
Multiple choice chemistry planet earth acid deposition air and air pollution natural resources- air, water and land

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

  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
Reveal answer Fill a bubble to check yourself
B 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 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.

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.