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
The inter-molecular space is maximum in
Select the correct alternative
The molecules can move freely anywhere in
- gases
- liquids
- solids
- none of the above
Fill in the blank
All matter is made up of tiny particles called ______
Define matter. Give four examples of matter.
Name the property which allows metals to be hammered into thin sheets.
State any two properties for believing that aluminium is a metal.
Which of the following does not have a fixed melting point/boiling point ?
How much water should be added to 15 grams of salt to obtain 15 per cent salt solution ?
How much water should be mixed with 12 mL of alcohol so as to obtain 12 % alcohol solution ?
What is the concentration of a solution which contains 16 g of urea in 120 g of solution ?
Classify the following into solutions, suspensions and colloids :
Soda-water, Milk, Brine, Blood, Ink, Smoke in air, Chalk water mixture, Milk of Magnesia, Shaving cream, Muddy river water.
Milk of Magnesia is :
The solubility of ammonium chloride in water at various temperatures is given below :
| Temperature | : | 10°C | 20°C | 40°C | 60°C | 80°C |
| Solubility | : | 24 g | 37 g | 41 g | 55 g | 66 g |
What mass of ammonium chloride would be needed to make a saturated solution of ammonium chloride in fifty grams of water at 40°C ?
How will you separate camphor, common salt and iron nails from their mixture ?
Explain how, impure copper sulphate can be purified by crystallisation.
What's the solution?
We need to make a sherbet quickly for some guests. But we only have sugar candy in the house.
What's the solution?
We need to rub salt on a corncob, but only salt crystals are available.
Seema visited a Natural Gas Compressing Unit and found that the gas can be liquefied under specific conditions of temperature and pressure. While sharing her experience with friends she got confused. Help her to identify the correct set of conditions
Which of the following are homogeneous in nature?
(i) ice
(ii) wood
(iii) soil
(iv) air
Write a scientific reason.
Lemon sherbat has a sweet, sour and salty taste and it can be poured in a glass.
