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Consider the following statements: 1. Gases have a very low critical temperature 2. Gases can be liquefied by isothermal compression 3. In engineering problems, water vapour in atmosphere is treated as an ideal or perfect gas Which of the above statements are correct?

Consider the following statements: 1. Gases have a very low critical temperature 2. Gases can be liquefied by isothermal compression 3. In engineering problems, water vapour in atmosphere is treated as an ideal or perfect gas Which of the above statements are correct? Correct Answer 2 and 3 only

Explanation:

There are three methods for liquefaction of gases:

  1. Isothermal compression
  2. Performance of the external work by the gas itself
  3. Use of Joule-Kelvin effect

Water vapour in atmosphere exists as a superheated gas. It can be assumed as ideal gas and atmospheric air can be treated as a mixture of two ideal gases, dry air and water vapour.

It is not appropriate to state that all gases have very low critical temperature.

The critical temperature of air is –140.5°C, while that of ammonia and CO2 are 132.4°C and 31°C respectively.

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