The minimum pressure required to compress 600 dm3 of a gas at 1 bar to 150 dm3 at 40°C is
1. 4.0 bar
2. 0.2 bar
3. 1.0 bar
4. 2.5 bar
A certain gas takes three times as long to effuse out as helium. Its molecular mass will be:
1. 36 u
2. 64 u
3. 9 u
4. 27 u
A bubble of air is underwater at a temperature15°C and the pressure 1.5 bar. If the bubble rises to the surface where the temperature is 25°C and the pressure is 1.0 bar, what will happen to the volume of the bubble?
1. Volume will become greater by a factor of 2.5
2. Volume will become greater by a factor of 1.6
3. Volume will become greater by a factor of 1.1
4. Volume will become smaller by a factor of 0.70
The pressure exerted by 6.0 g of methane gas in a 0.03 m3 vessel at 129 ºC is:
(Atomic masses : C = 12.01, H = 1.01 and R = 8.314 JK–1mol–1)
1. 13409 Pa
2. 41648 Pa
3. 31684 Pa
4. 215216 Pa
For real gases van der Waals equation is written as
where 'a' and 'b' are van der Waals constants.
Two sets of gases are:
(I) (II)
The gases given in set-I are in increasing order of 'b' and gases given in set-II are in decreasing order of 'a'. Select the correct order from the following:
1.
2.
3.
4.
34.05 mL of phosphorus vapour weighs 0.0625 g at 546 °C and 0.1 bar pressure. The molar mass of phosphorus would be -
The density of a gas is found to be 5.46 g/dm3 at 27°C at 2 bar pressure. The density of gas at STP would be -
Average molar kinetic energy of CO and N2 at same temperature is:
1. KE1 = KE2
2. KE1 > KE2
3. KE1 < KE2
4. Can't say anything. Both volumes are not given.
In a gaseous mixture which of gases have the same rate of diffusion:
1.
2.
3.
4. All of the above.
If 400 ml gas at 500 torrs and 666.6 ml gas at 600 torrs is taken in a container of 3 liters, then the total pressure of the mixture is:
1. 200 torr
2. 400 torr
3. 600 torr
4. 50 torr