Direction (Q. Nos. 1-14) This section contains 14 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE option is correct.

Q. 50 mL of H₂ gas diffuse through a small hole from a vessel in 20 min. Time taken by 40 ml. of O₂ gas to diffuse under similar conditions will be

It takes 26 s for 10 mL of H₂ gas to effuse through a porous membrane, it takes 130 s for 10 mL of an unknown gas under identical conditions to effuse. Hence, molar mass of the unknown gas (in g mol^-1) is

100 mL of O₂ gas diffuse in 10 s. 100 mL of gas X diffuse in t s. Gas X and time t respectively can be

Rate of diffusion of LPG (mixture of n-butane and propane) is 1.25 times faster than that of SO₃. Hence, mole fraction of n-butane in LPG is

Assume that the air in the space vehicle cabin consists of O₂ with mole fraction, 0.20. if air contains both N₂ and O₂, then fraction of O₂ that comes out the hole is 

Consider a tube that has a frilled disk sealed in its centre so that gases can effuse through it in both directions. If the left hand side contains H₂ at a pressure p and temperature T and the right hand side contains He at a pressure 2p and temperature T, then initial ratio of rate of effusion is 

According to Graham’s law at a given temperature, the rates of diffusion r_A / r_B of gases A and B is given by (where, p and M are partial pressure and molar masses)

[IIT JEE 1998, 2011]

If helium and methane are allowed to diffuse out of the container under the similar conditions of temperature and pressure, then the ratio of rate of diffusion of helium to methane is

[IIT JEE 2005]

Sulphur dioxide and oxygen were allowed to diffuse through a porous partition. 20 dm³ of SO₂ diffuses through the porous partition in 60 s. The volume of O₂ (in dm3) which diffuses in 30 s will be (atomic mass of sulphur = 32 u)

[JEE Main 2014]

A vessel contains 0.5 mole each of SO₂, H2 and CH₄.  Its outlet was made open and closed after some time. Thus, order of partial pressure inside the vessel will be

Consider the following pairs of gases A and B

Q. Thus, relative rates of diffusion of gases A and B is in the order 

1 mole of helium and 3 moles of N₂ exert a pressure of 16 atm. Due to a hole in the vessel in which mixture is placed, mixture leaks out. Thus, composition of the mixture effusing out initially is

For 10 min each, at 27°C from two identical holes, nitrogen and an unknown gas are leaked into a common vessel of 3 L capacity. The resulting pressure is 4.18 bar and the mixture contains 0.4 mole of nitrogen gas. Thus, molar mass of the unknown gas is (g mol^-1)

At the start of an experiment, one end of a U-tube of 6 mm glass tubing is immersed in concentrated ammonia solution and the other end in concentrated hydrochloric acid. At the point in the tube where vapours of ammonia and hydrochloric acid meet, white cloud is formed. At what fraction of the distance along the tube from the ammonia solution, the white cloud first form ?