Separation of the constituents of air
Separation of The Constituents of Air
The invisible gaseous substance surrounding the earth, a mixture mainly of oxygen and nitrogen. Air is a homogeneous mixture and can be separated into its components by fractional distillation. For this purpose, the air is compressed by increasing the pressure and cooled to a very low temperature. Thus, liquid air is obtained. This liquid air is allowed to warm up slowly in a fractional distillation column, where gases get separated at different heights depending upon the boiling points.
The constituents of air can be separated by fractional distillation method. You know that air is a mixture consisting mainly of nitrogen and oxygen. Carbon dioxide and other gases are also present in trace amounts. To separate the components, air is gradually cooled.
Water vapour present in air condenses to water. When the temperature reaches 0°C, water freezes to ice. On further cooling, carbon dioxide separates as dry ice at about —78°C. Air is cooled further under pressure to about —200°C. At this temperature air gets liquefied. This liquid air contains mainly nitrogen and oxygen. It is now heated. Nitrogen (boiling point —196°C) is converted into vapour (gas) and is collected. Oxygen, whose boiling point is —183°C, is left behind. It is collected separately.
Nitrogen is separated from oxygen by fractional distillation. In the process of fractional distillation,different components of mixture can be separated based on difference in __________________. | |||
| Right Option : A | |||
| View Explanation | |||
Which of the following are correct : (a) Water vapour present in air condenses to water. (b) When the temperature reaches 0°C, water freezes to ice. (c) Air is cooled further under pressure to about —200°C. | |||
| Right Option : D | |||
| View Explanation | |||
Water vapour present in air condenses to__________________. | |||
| Right Option : A | |||
| View Explanation | |||
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