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

$2.$ $1-\frac{\mathrm{Pb}}{\mathrm{RT}}$
$3.$ $1+\frac{\mathrm{Pb}}{\mathrm{RT}}$

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

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

7.0 g of gas occupies 5.6 L of volume at STP. The gas is-

1. NO

2. ${\mathrm{N}}_2\mathrm{O}$

3. CO

4. ${\mathrm{CO}}_2$ 

The volume occupied by 1.8 g of water vapour at 374 ${}^{\mathrm{o}}\mathrm{C}$ and 1 bar pressure will be -

[Use R=0.083 bar ${\mathrm{LK}}^{-1}$ ${\mathrm{mol}}^{-1}$]

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. $2\sqrt{2}$

2. $6/\sqrt{2}$

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