The average kinetic energy of two moles of at a certain temperature is 1800 cal. The temperature of the gas is
(A) 300 K
(B) 150 K
(C) 200 K
(D) 400 K
For a real gas, PV is a constant over a small range of pressures at-
1. Boyle’s temperature
2. Critical temperature
3. Inversion temperature
4. Ordinary temperature
A vessel of volume contains a mixture of hydrogen and helium at 20°C and 2 atm pressure. The mass of the mixture is 5 g. The ratio of the mass of hydrogen to that of helium in the mixture, is -
1. 1:2
2. 1:3
3. 2:3
4. 3:2
Four particles have velocities 1, 0, 2, 3 m/s. The root mean square of the particles is (in m/s)
(A)
(B)
(C)
(D)
Joule-Thomson expansion of an ideal gas is an
(1) Isothermal process
(2) Isobaric process
(3) Isoenthalpic process
(4) Ideal process
The pressure-volume plot for an ideal gas at a given temperature has the form of a -
1. Straight line
2. Exponential curve
3. Rectangular hyperbola
4. U-shaped curve
The average, RMS and most probable velocities of gas molecules at STP increase in the order
(1) RMS < average velocity < most probable velocity
(2) Most probable velocity < average velocity < RMS
(3) Average velocity < RMS < most probable velocity
(4) RMS < most probable velocity < average velocity
Equal volumes of and at a temperature T and pressure P are allowed to effuse through a hole. The rate of effusion of helium is
(1) Equal to the rate of effusion of
(2) Four times the rate of effusion of
(3) Half of the rate of effusion of
(4) Twice the rate of effusion of
Flask X is filled with 20 g of gas at 100 °C and another identical flask Y with 40 g gas at the same temperature. The correct statement among the following is –
1. The pressure of the gases in the two flasks is identical
2. The pressure of in flask X is higher than that of in flask Y
3. The pressure of in flask X is lower than that of in flask Y
4. The pressure of in flask X is half that of in flask Y
A certain volume of argon gas (Mol. wt. = 40) requires 45 s to effuse through a hole at a certain pressure and temperature. The same volume of another gas of unknown molecular weight requires 60s to pass through the same hole under the same conditions of temperature and pressure. The molecular weight of the gas is
(1) 53
(2) 35
(3) 71
(4) 120