Chemistry - Ideal Gas Question with Solution | TestHub
A container (cylindrical, base area = 821 cm2) fitted with frictionless, massless piston consist of five valves - I, II, III, IV and V. The distance of valves from the initial position of piston is 15, 30, 40, 45 and 50 cm, respectively. The initial height of piston from the base of container was 60 cm. These valves open automatically if pressure exceeds over 1.5, 2.2, 2.5, 4.4 and 4.8 atm, respectively. Under the given conditions (shown in the diagram), the system is in state of equilibrium. Piston is now compressed (moved downward) slowly and isothermally. Neglect the volumes of valve connectors.
During this slow isothermal compression, which of the following changes for the gas molecules?
Options:(select one or more)
Answer:
Solution:
During the slow isothermal compression the temperature stays fixed, so the average molecular speed, and hence the average momentum of a molecule, does not change. The compression raises the number density of the gas, so the frequency with which molecules collide (with the walls and with each other) increases. Only the frequency of collision changes. Hence (b).
