Tag: component of air - nitrogen

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Multiple choice chemistry air and atmosphere natural cycles and resources constituents of air component of air - nitrogen

Lime water turns milky when exposed. to air and stirred. This shows that air contains:

  1. carbon dioxide

  2. hydrogen

  3. nitrogen

  4. oxygen
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Lime water turns milky when exposed to air and stirred as lime water mixes with $CO _{2}$ and forms $CaCO _{3}$ (calcium carbonate) which turns the lime water milky. 

$CaO+CO _{2} \longrightarrow CaCO _{3}$

Multiple choice chemistry nitrogen and sulfur nitrogen gas component of air - nitrogen nitrogen

Nitrogen is used to fill electric bulbs because:

  1. it is lighter than air

  2. it makes the bulb to glow

  3. it does not support combustion

  4. it is non-toxic.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Nitrogen is used because it doesn't react with the hot filament. Then, it will carry heat away form the filament to cool it.

Multiple choice chemistry nitrogen and sulfur nitrogen gas component of air - nitrogen nitrogen

Nitrogen is relatively inactive element because:

  1. its atoms has a stable electronic configuration

  2. it has low atomic radius

  3. its electronegativity is fairly high

  4. dissociation energy of its molecule is fairly high
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Nitrogen is an inactive element as it has a high bond dissociation energy due to the presence of triple bond $N\equiv N$. Hence, viewed as a non-reactive element.

Multiple choice chemistry nitrogen and sulfur nitrogen gas component of air - nitrogen nitrogen

Which of the following is not the application of nitrogen?

  1. Refrigerant

  2. Metallurgy

  3. Match sticks

  4. Electric bulbs
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Liquid nitrogen is a cryogenic liquid. Like dry ice, the main use of liquid nitrogen is as a refrigerant. 

 Nitrogen is used to provide an inert atmosphere in metallurgy to prevent oxidation in certain industrial processes.
You can't fill a bulb with air or combustion of hot tungsten wire at high temperature will take place in presence of oxygen. You can't maintain vacuum either or external atmospheric pressure will break the glass. So, you have to fill it with non-reactive gas like nitrogen.