Question

A real gas most closely approaches the behaviour of an ideal gas at

(a) 15 atmospheres and 200 K

(b) 1 atm and 273 K

(c) 0.5 atm and 500 K

(d) 15 atm and 500 K

Answer 1

Correct option is (c) 0.5 atm and 500 K

A real gas most closely approaches the behaviour of an ideal gas when the intermolecular distances are huge and the kinetic energy is high, i.e. at lower pressures and higher temperatures.