For one mole of van der Waal's gas when b=0 and T=300 K, the PV vs. 1/V plot is shown below.
The value of the van der Waal's constant 'a' (atm. ) is-
1. 1.0
2. 4.5
3. 1.5
4. 3.0
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
At room temperature, the average speed of Helium is higher than that of Oxygen by a factor of -
1.
2.
3. 8
4. 6
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
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
Van der Waals equation at low pressure is -
1. PV = RT - Pb
2. PV = RT -
3. PV = RT +
4. PV = RT + Pb
The density of a gaseous substance at 1 atm pressure and 773 K is 0.4 g/L. If the molecular weight of the substance is 30, the dominant force existing among gas molecules is/are-
1. Repulsive
2. Attractive
3. Both (1) & (2)
4. None of these
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