Tag: air around us

Questions Related to air around us

Ozone hole means :

chemistry air around us importance of oxygen is air present everywhere around us? air as a natural resource

  1. thinning of the ozone layer

  2. a large sized hole in ozone layer

  3. small hole scattered in the ozone layer

  4. thickening of ozone in ozone layer

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Correct Option: A
Explanation:

"Ozone hole" means thinning of the ozone layer.


The ozone hole is not technically a “hole” where no ozone is present but is actually a region of exceptionally depleted ozone layer.

Hence the option A is correct.

Choose the correct answer form the alternatives given.
Scuba divers are at high risk due to high concentration of dissolved gases while breathing air at high pressure under water. The tanks used by Scuba divers are filled with :-

chemistry air around us importance of oxygen is air present everywhere around us? air as a natural resource

  1. Air diluted with helium

  2. 02

  3. N

  4. A mixture of nitrogen and helium

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Correct Option: A

The nitrogen molecules present in the air can be converted into nitrates and nitrites by :

chemistry air around us importance of oxygen is air present everywhere around us? air as a natural resource

  1. nitrogen fixation

  2. carbon fixation

  3. industries in the form of by ctprodu

  4. cereal plants

Show answer
Correct Option: A
Explanation:

The nitrogen molecules present in the air can be converted into nitrates and nitrites by nitrogen fixation.


Hence the option A is correct.

Reformation of ozone in stratosphere is powered by :

chemistry air around us importance of oxygen is air present everywhere around us? air as a natural resource

  1. atmospheric oxygen

  2. UV radiation

  3. sunlight

  4. heat

Show answer
Correct Option: B
Explanation:

Reformation of ozone in stratosphere is powered by UV radiation.

The part of atmosphere which contains constant gases with known composition called :

chemistry air around us importance of oxygen is air present everywhere around us? air as a natural resource

  1. Homosphere

  2. Thermosphere

  3. Heterosphere

  4. None of these

Show answer
Correct Option: A
Explanation:

The part of the atmosphere which contains constant gases with a known composition called homo-sphere.

The homosphere is the lower of the two and the location in which turbulent mixing dominates the molecular diffusion of gases. In this region, which occurs below 100 km (about 60 miles) or so, the composition of the atmosphere tends to be independent of height.

Air is an example of __________.

water and air and their importance natural resources- air, water and land air around us air chemistry

  1. gas solid solution

  2. gas gas solution

  3. solid solid solution

  4. solid gas solution

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Correct Option: B
Explanation:

Air is a mixture of gases. So, solute and solvent both are gases.

hence, air is known as gas gas solution.

Which is a green house gas?
A) Methane 

B) Chlorofluorocarbons 
C) $CO _{2}$

water and air and their importance natural resources- air, water and land air around us air chemistry introduction to natural resources land

  1. $A$ and $B$

  2. $B$ and $C$

  3. $C$ and $D$

  4. $A, B$ and $C$

Show answer
Correct Option: D
Explanation:

Greenhouse effect
* The progressive heating up of surface of the earth is earth is called green house effect or global warming.
 $CO _2$ and $H _2O$ block a part of the heat (IR) emitted by the earth & reflect back. Due to this earth surface gets heated up.
 50% in $CO _2$ content of air can increase the surface temperature of the earth by $3^oC$.
* In addition to $CO _2$ , the other green - house gases are CFCs (17%), $O _3$ (18%), NO (4%), water vapour (2%).

Which of the following is not a sink for CO?

water and air and their importance natural resources- air, water and land air around us air chemistry introduction to natural resources land

  1. Haemoglobin

  2. Microorganims present in the soil

  3. Oceans

  4. None of the above

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Correct Option: A
Explanation:


* Incomplete combustion of fossil fuels liberate CO into air. 80% of CO is released from automobiles.


* Permissible level of CO in air is 9 ppm. It reduces $O _2$ supply in human by forming a stable carboxyhaemoglobin.

$2C+O _2\rightarrow 2CO$
$2CH _4+3O _2\rightarrow 2CO+4H _2O$

* CO interacts with oxyhaemoglobin ($O _2Hb$) and forms carboxyhaemoglobin (CO-Hb) as :

$O _2Hb+CO\rightarrow COHb+O _2$

* CO has high affinity for haemoglobin than that of oxygen.

Therefore, option A is correct.

The ash can cause _______ problems.

water and air and their importance natural resources- air, water and land air around us air chemistry introduction to natural resources land

  1. digestive 

  2. reproductory 

  3. respiratory 

  4. nervous 

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Correct Option: C
Explanation:

The ash can cause respiratory problems for young children, the elderly or those already with respiratory ailments.

The most problematic gases emitted in a volcanic eruption includes :

water and air and their importance natural resources- air, water and land air around us air chemistry introduction to natural resources land

  1. sulphur dioxide

  2. carbon dioxide

  3. hydrogen fluoride

  4. All of the above

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Correct Option: D