The unit of van der Waals' constant 'b' is -
1. cm3 mol-1
2. litre mol-1
3. m3 mol-1
4. All of the above
The compressibility factor for H2 and He is usually-
1. >1
2. =1
3. <1
4. Zero
In which case is the rate of diffusion highest if all are present in the same container at the same temperature:
1. 4 g H2
2. 32 g O2
3. 22 g CO2
4. 56 g N2
At high pressure, the compressibility factor 'Z' is equal to -
1. Unity
4. Zero
20 L of SO2 diffuses through a porous partition in 60s. The volume of O2 that will diffuse under similar condition in 30s will be:-
1. 12.14 L
2. 14.14 L
3. 18.14 L
4. 28.14 L
7.0 g of gas occupies 5.6 L of volume at STP. The gas is-
1. NO
2.
3. CO
4.
The volume occupied by 1.8 g of water vapour at 374 and 1 bar pressure will be -
[Use R=0.083 bar ]
1. 96.66 L
2. 55.87 L
3. 3.10 L
4. 5.31 L
In water-saturated air, the mole fraction of water vapor is 0.02. If the total pressure of the saturated air is 1.2 atm, the partial pressure of dry air is-
1. 1.17 atm
2. 1.76 atm
3. 1.27 atm
4. 0.98 atm
At room temperature, the average speed of Helium is higher than that of Oxygen by a factor of -
1.
2.
3. 8
4. 6
At 298 K, assuming ideal behaviour, the average kinetic energy of a deuterium molecule is -
1. Two times that of a hydrogen molecule
2. Four times that of a hydrogen molecule
3. Half of that of a hydrogen molecule
4. Same as that of a hydrogen molecule