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

Density ratio of O₂ and H₂ is 16 : 1. The ratio of their r.m.s. velocities will be- 

1. 4 : 1

2. 1 : 16

3. 1 : 4

4. 16 : 1

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

The rate of diffusion of methane at a given temperature is twice that of a gas X. The molecular weight of X is

1. 64.0

2. 32.0

3. 4.0

4. 8.0