Tag: chemistry

Questions Related to chemistry

Heavy _____ is responsible for decreasing the UV radiation greatly.

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

  1. smoke

  2. smog

  3. both $A$ and $B$

  4. none of the above

Show answer
Correct Option: B
Explanation:

Heavy smog is responsible for decreasing the UV radiation greatly.

Smoke is a form of wet deposition of acid rain. True or false?

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: B
Explanation:

Smoke is a form of dry deposition of acid rain.

What occurs when acidic oxides generated of carbon, nitrogen and sulphur due to burning of fossil fuels come in contact of rain?

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

  1. Acid rain

  2. Basic Rain

  3. Normal Rain

  4. Hailstorms

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Correct Option: A
Explanation:

Acid rains are caused when the pollutants such as sulphur dioxide and nitrous oxide formed due to the burning of the fossil fuels are released in the atmosphere, where they travel upwards and mixes with oxygen, air and moisture to form pollutants called acidic oxide pollutants.

The pH of acid rain is in the range:

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

  1. 2 to 3.5

  2. 3.5 to 5.6

  3. 5.6 to 6.5

  4. 1 to 3.5

Show answer
Correct Option: B
Explanation:

The pH of acid rain is in the range 3.5 to 5.6 . Typical value can be 4.0 .

Which of the following is not a cause of acid rain?

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

  1. Burning of fossil fuels

  2. Bacterial decomposition of organic matter

  3. Internal combustion engines

  4. None of the above

Show answer
Correct Option: D
Explanation:

The causes of acid rain are:

  • Burning of fossil fuels
  • Bacterial decomposition of organic matter
  • Internal combustion engines

Which of the following is a wet deposition of acid rain?

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

  1. Fog

  2. Rain

  3. Snow

  4. All of the above

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Correct Option: D
Explanation:

Wet deposition is rain, sleet, snow, or fog that has become more acidic than normal. Wet deposition of acids occurs when any form of precipitation removes acids from the atmosphere and delivers it to the Earth's surface.

Rain, snow or fog, which is acidic in nature, is known as:

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

  1. acid rain

  2. acid snow

  3. acid fog

  4. all of the above

Show answer
Correct Option: A
Explanation:

Acid rain includes any form of precipitation with acidic components from the atmosphere.

This can include rain, snow, fog, hail or even dust that is acidic.
This happens when oxides of sulphur and nitrogen that are emitted by the industries react with water and oxygen in the atmosphere to form sulphuric acid and nitric acid respectively.
These acids are responsible for the acidic nature of the rains. Their pH is usually between 5.5 to 5.
Thus, the correct answer is option (A).

Which of the following gases related with acid rain?

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

  1. ${ NO } _{ 2 }$ and ${ CO } _{ 2 }$

  2. ${ CH } _{ 4 }$ and ${ SO } _{ 2 }$

  3. ${ CO } _{ 2 }$ and ${ SO } _{ 2 }$

  4. ${ SO } _{ 2 }$ and ${ NO } _{ 2 }$

Show answer
Correct Option: D
Explanation:

${ SO } _{ 2 }$ and ${ NO } _{ 2 }$:burning of fossil fuels releases oxides of sulphur and nitrogen, ${ SO } _{ 2 }$ and ${ NO } _{ 2 }$ reacts with water and oxygen and other chemicals to form sulphuric acid and nitric acid.

 Acid rain happens because:

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

  1. sun leads to heating of upper layer of atmosphere

  2. the burning of fossil fuels release oxides of carbon, nitrogen, and sulphur in the atmosphere

  3. electrical charges are produced due to friction amongst clouds

  4. earth atmosphere contains acids

Show answer
Correct Option: B
Explanation:

 Acid rain is caused by emissions of acidic gases like sulphur dioxide, nitrogen and carbon oxides, which react with the water  molecules in the atmosphere to produce acids. 

Assertion(A) : Rainwater normally has a $pH$ $= $ 5.6


Reason (R) : This is due to the presence of $H _{2}SO _{4}$ and $HNO _{3}$ produced from oxides of sulphur and nitrogen.

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

  1. Both A and R are true and R is the correct explanation of A.

  2. Both A and R are true but R is not correct explanation of A.

  3. A is true and R is false.

  4. A is false and R is true

Show answer
Correct Option: C
Explanation:
Normal rain has a pH of about 5.6. This is because it reacts with carbon dioxide in the atmosphere and forms mildly acidic carbonic acid before it becomes rain.

Acid rains occur due to oxides of nitrogen and sulphur.

Nitric acid & sulphuric acid in the atmosphere dissolve in rainwater and come down to earth as acid rain. 

Acid rains have a pH 4.

Therefore, option C is correct