Advertisements
Advertisements
Question
Explain how, nitrogen , oxygen and argon gases are separated from air.
Advertisements
Solution
Nitrogen, oxygen and argon are separated from air by fractional distillation. Following are the steps followed to separate these gases from air:
- Air is first filtered to remove the dust particles, spores etc. Subsequently water vapours and carbon dioxide are removed.
- Air is subjected to high pressure and then cooled. This air is then allowed to expand in a chamber which causes further cooling of the air.
- This process is repeated to cool the air further. Ultimately, the air becomes so cold that it turns into a liquid.
- This liquid air is then fed into a fractionating column from its bottom end and is cooled slowly.
- Liquid nitrogen boils off first to nitrogen gas as the boiling point of nitrogen is lowest at -196°C.
- Liquid argon boils off at a boiling point of -186°C.
- Liquid oxygen boils off last as it has highest boiling point among all three (around -183°C).
Figure 84. Separation of the major gases of air.
APPEARS IN
RELATED QUESTIONS
Gases have definite volume but no definite shape.
What are the two conditions for the interconversion of states of matter ?
Write true or false for each statement. Rewrite the false statement correctly.
Matter cannot exist in different states.
Name the scientist who studied the movement of pollen grains suspended in water through a microscope. What is this phenomenon known as?
When a gas jar containing air is inverted over a gas jar containing bromine vapour, the red-brown bromine vapour diffuse into air. Explain how bromine vapour diffuse into air.
Give reason why copper metal is used for making electric wires.
What is the name of the clear liquid formed when a solid dissolves in a liquid ?
Define Aerosol Give one example.
What is a suspension ? Give two examples of suspensions.
Which of the following is not an emulsion ?
When the solid A is added to water, it dissolves with the evolution of a lot of heat and making little explosions to form two products B and C. The properties of products B and C are entirely different from those of solid A as well as water. Moreover, products B and C cannot be reconverted into solid A and water. When another solid D is added to water, it dissolves with the absorption of a little heat to form a product E which cools down. The product E shows the properties of both, solid D as well as water. Moreover, product E can be converted into solid D and water.
(a) What type of change occurs when solid A is dissolved in water ? Why ?
(b) What type of change occurs when solid D is dissolved in water ? Why ?
(c) Name a metal which you think could behave like solid A. Also name the products B and C.
(d) Name the solid D if it is the one which is used in making ordinary dry cells.
(e) Name the process by which D can be recovered from E.
Fill in the following blanks with suitable words :
The separation of liquids by fractional distillation is based on the difference in their .....................
What is chromatography ? State its two applications.
Which of the following mixture cannot be separated by using water as the solvent ?
Asmita went to buy an earthen pot. There she saw many things kept for sale.
From what substance has the potter made all the things?
Solids possess very high kinetic energy.
Liquids cannot be compressed and they have fixed volume.
Solid is an arrangement of particles ______.
Define the term matter.
Define the term matter.
