Tag: chemistry

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

What is so important about the troposphere?

  1. Layer of water at or near Earths surface

  2. Contains ozone

  3. It contains weather and the oxygen that we breath

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

The troposphere is the lowest portion of earth's atmosphere and is also where all weather takes place. It contains approximately 75% of the atmosphere's mass and 99% of its water vapour and aerosols.

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.