LIVE Course for free

Rated by 1 million+ students
Get app now
0 votes
12 views
in Chemistry by (54.3k points)
closed by
The temperature at which the real gases obey ideal gas laws is called?
1. Critical temperature
2. Boyle's temperature
3. Inversion Temperature
4. None of these

1 Answer

0 votes
by (30.0k points)
selected by
 
Best answer
Correct Answer - Option 2 : Boyle's temperature

Explanation:

Critical temperature:

  • The critical temperature of a gas is defined as the temperature above which it cannot be liquified, howsoever high pressure is applied.
  • For example, the critical temperature of carbon dioxide is 304.2 K, which means that it is impossible to liquefy carbon dioxide above 304.2 K by any means.
  • The critical temperature of gas gives an indication of the strength of the intermolecular attractive forces of that gas.
  • A substance with weak attractive forces would have a low critical temperature and vice versa.


Boyle's temperature

  • The extent of deviation from ideal behaviour decrease with an increase in temperature.
  • The real gases show ideal behaviour only at low pressure and high temperature.
  • The temperature at which a gas behaves as an ideal gas and obeys the gas Law is called Boyle's Temperature.
  • Boyle point or Boyle temperature of a gas depends on its nature.
  • Above Boyle point, gases show positive deviation from ideal behaviour.
  • In this condition, the compressibility factor, Z > 1 and the gases are less compressible.
  • Below Boyle point, gases show negative deviation from ideal behaviour.
  • In this condition, Z < 1 and gases are highly compressible.
  • The Boyle temperature is given by 

 \(T_b = {a \over Rb}\). Where 'a' and 'b' are van der Waals constants.

Inversion temperature-

  • The temperature below which the real gases show cooling effect and above which gases show the heating effect when expanded under adiabatic conditions.
  • It is given by

 \(T_i = {2a \over Rb}\). Where 'a' and 'b' are van der Waals constants.

  • Gases having low inversion temperatures have b > a, which means they have repulsive forces predominant and can expand easily.
  • The higher temperature of inversion means 'a' > 'b', signifying that attractive forces are predominant.

Hence, the temperature at which the real gases obey ideal gas laws is called Boyle's temperature.

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

Categories

...