The rate of diffusion of two gases A and B is in the ratio of 1:4 and the B and C in the ratio 1:3 the rate of diffusion of C with respect to A is
1. 1/12
2. 12
3. 3
4. 4
A sample of air contains only N2, O2 and H2O. It is saturated with water vapours and the total pressure of 640 torr. The vapoure pressure of water is 40 torr and the molar ratio of N2:O2 is 3:1. The partial pressure of N2 in the sample in
1. 480 torr
2. 600 torr
3. 525 torr
4. 450 torr
The temperature at which the r.m.s velocity of carbon dioxide becomes the same as that of nitrogen at 210C is-
1. 462 oC
2. 273 K
3. 189 oC
4. 546 K
At what temperature will the total K.E. of 0.3 mol of He be the same as the total K.E. of 0.4 mol of Ar at 400 K
1. 400K
2. 300K
3. 346K
4. 533K
The density of O2(g) is maximum at-
1. STP
2. 273 K and 2 atm
3. 546 K and 1 atm
4. 546 K and 2 atm
20 L of SO2 diffuses through a porous partition in 60s. Volume of O2 diffuse under similar condition in 30s will be:-
1. 12.14 L
2. 14.14 L
3. 18.14 L
4. 28.14 L
In van der Waal's equation of state for a non-ideal gas, the term that accounts for the intermolecular force is-
1. V-b
2. (P+a/V2)
3. RT
4. (RT)-1
At moderate pressure, the van der Waal's equation becomes:
1. PVm = RT
2. P(Vm-b) = RT
3. (P+a/V2m) (Vm )= RT
4. P = RT/Vm + a/V2m
The compressibility factor for a real gas at high pressure is:-
1. 1
2. 1+Pb/RT
3. 1-Pb/RT
4. 1-RT/Pb
A gas diffuses four time quickly as oxygen. The molecular weight of gas is:
1. 2
2. 4
3. 8
4. 16