Tag: air and air pollution

Questions Related to air and air pollution

$SO _2$ is known to produce acid rain.

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

  1. True

  2. False

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Correct Option: A
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}$

Photochemical smog is also called as____________.

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

  1. London Smog

  2. sulphurous acid smog

  3. Both $A$ and $B$

  4. Los angles smog

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Correct Option: D
Explanation:

Smog is two types:
1) Classical smog is also called as London smog or sulphurous acid smog.
2) Photochemical smog is also called as Los angles smog. 
Hence option D is correct.

Acid rain contains:

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

  1. sulphuric acid

  2. nitric acid

  3. hydrochloric acid

  4. all of the above

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Correct Option: D
Explanation:

The main constituents of acid rain are sulphuric acid and nitric acid. Hydrochloric acid is also present in acid rain in small amount.

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

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

  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

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Correct Option: B
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. 

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

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

  1. exosphere

  2. mesosphere

  3. ionosphere

  4. stratosphere

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Correct Option: D
Explanation:

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

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

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

  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.

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Correct Option: A
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. 

Which of the following is not an air pollutant?

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

  1. $H _{2}$

  2. $SO _{2}$

  3. $O _{3}$

  4. $NO _{x}$

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Correct Option: A
Explanation:

$SO _2, O _3, NO _x$ causes pollution. They are examples of smog or photochemical smog. But $H _2$ being a clean fuel does not pollute the air.

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

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

  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. $CaC{ O } _{ 3 }\longrightarrow CaO+C{ O } _{ 2 }$

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Correct Option: A
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.  

Acid rain is produced by:

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

  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

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Correct Option: C
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. 

Which of the following statements is not true?

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

  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.

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Correct Option: C
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.