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

$SO _2$ is known to produce acid rain.

  1. True

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

$ {S}{O} _{2} $ produces acid rain. It reacts with atmospheric oxygen to produce $ {S}{O} _{3} $. This sulphur trioxide reacts with water to produce Sulphuric Acid. Thus acid rain is produced.

$ {2}{S}{O} _{2} $ ${+}$ $ {O} _{2} $ ${=}$ $ {2}{S}{O} _{3} $
$ {S}{O} _{3} $ ${+}$ $ {H} _{2}{O} $ ${=}$ $ {H} _{2}{S}{O} _{4}$

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

'Smog', which means 'smoke' plus 'fog', irritates eyes and the throat. Smog is mainly caused by pollutants from automobiles and industries when they:

  1. hit a dense shower of snow flakes

  2. react photochemically, due to the effect of ultraviolet light

  3. form a smoke ring

  4. react with oxygen in the air due to lightning electrical discharge from clouds
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Smog is especially common from automobile exhaust. A chemical reaction between solar ultraviolet radiation and an atmosphere polluted with hydrocarbons and oxides of nitrogen causes photochemical smog. 
Multiple choice chemistry planet earth acid deposition air and air pollution natural resources- air, water and land

The zone which extends above troposphere up to 50 km above sea level and contains dinitrogen, dioxygen, ozone and little water vapour is called:

  1. exosphere

  2. mesosphere

  3. ionosphere

  4. stratosphere
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Stratosphere ranges from 20-50 km. It is the layer above troposphere. Stratosphere contains ozone as it's main species.

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

Sulphur oxides which are responsible for major air pollution are caused by:

  1. burning of coal and refining of pertoleum

  2. burning of fuels in automobiles

  3. combustion of fuels containing C and H

  4. using indoor combustion devices like cooking gas.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$SO _2$ is a major gaseous pollutant found in the lower atmosphere. They are the compounds of sulphur and oxygen molecules. So when the fuels such as coal and oil are burnt, it leads to emission of $SO _2$ gas. 

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

Which of the following reactions is taking place resulting in discolouration of marble of the buildings like Taj Mahal?

  1. $CaC{ O } _{ 3 }+{ H } _{ 2 }S{ O } _{ 4 }\longrightarrow CaS{ O } _{ 4 }+{ H } _{ 2 }O+C{ O } _{ 2 }$
  2. $CaC{ O } _{ 3 }+{ H }Cl\longrightarrow CaC{ l } _{ 2 }+{ H } _{ 2 }O+C{ O } _{ 2 }$
  3. $CaC{ O } _{ 3 }+{ H } _{ 2 }O\longrightarrow Ca{ \left( OH \right) } _{ 2 }+C{ O } _{ 2 }$
  4. $CaC{ O } _{ 3 }\longrightarrow CaO+C{ O } _{ 2 }$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Acid rain is the state when the pH of rain falls below 5.6.  Acid rain damages the buildings and statues as they dissolve and corrodes the heavy metals. This happens when sulphuric acid nitric acids in the polluted air react with calcite in marble, the calcite dissolves. It also dissolves metals from soils, rocks and sediments.  

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

Acid rain is produced by:

  1. excessive release of CO in air
  2. excessive release of $SO _{2}$ and $H _{2}S$ in air
  3. excessive release of $NO _{2}$ and $SO _{2}$ in air
  4. excessive release of $NH _{3}$ and $CO _{2}$ in air
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Acid rain is the state when pH of rain falls 5.6. It is mainly due to the presence of oxides of sulphur and nitrogen ( $ NO _2 $ and  $ SO _2 $ in the atmosphere. They are transported into the atmosphere by wind an other air currents. 

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

Which of the following statements is not true?

  1. Ammonia acts as sink for $NO _{x}$.
  2. Limestone acts as sink for $SO _{x}$

  3. The average residence time of NO is one month.
  4. $SO _{x}$ can be removed from flue gases by passing through a solution of citrate ions.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Residence time means the lifetime amount of chemicals in the atmosphere divided by the rate at which the chemicals are eliminated from the atmosphere. The average residence time of NO is 0.5 to 2 days.