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Question

Which of the following statements is incorrect?
  1. It is not possible to compress a gas at a temperature below Tc.
  2. No condensation takes place above Tc
  3. The kinetic energy of the gas molecules is higher above Tc, and the attraction between them decreases.
  4. At a temperature below Tc, the molecules are slow enough for the attractive forces to act, and hence condensation occurs.


Solution

The correct option is A It is not possible to compress a gas at a temperature below Tc.
The critical temperature (Tc) of any gas is defined as the temperature above which a gas cannot be liquefied, no matter how much pressure is applied. Gases can only be converted into liquids by compressing it at a suitable temperature and pressure. Gases can be liquefied below the critical temperature because below Tc the molecules are very close to each other as their kinetic energy is very less and particles have significant force of attraction. The liquification of gas become more difficult as the temperature increases because the kinetic energies of the particles also increase.
Hence the options B,C and D are correct stataments and hence incorrect statement is A.
 

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