The kinetic energy in kcal of 80 gms of methane gas at 227°C is
(1) 15
(2) 2.5
(3) 25
(4) 7.5
The ratio,, of sulphur dioxide and helium gases at 30ºC is equal to
(A) 4
(B) 0.25
(C) 0.10
(D) 8
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