50 mL of each gas A and of gas B takes 150 and 200 s respectively for effusing through a pin hole under the similar conditions. If molecular mass of gas B is 36, the molecular mass of gas A will be

• 96

• 128

• 20.2

• 20.2

p_A and p_B are the vapour pressure of pure liquid components, A and B, respectively of and ideal binary solution. If x_A represents the mole fraction of component A, the total pressure of the solution will be

• p_A + x_A(p_B-p_A)

• p_A + x_A(p_A-p_B)

• p_B + x_A(p_B-p_A)

• p_B + x_A(p_B-p_A)

A  certain gas takes three times as long to effuse out as helium. Its molecular mass will be 

• 27 u

• 36 u 

• 64 u

• 64 u

For real gases van der Waal's equation is written as,


where, a and b are van der Waal's constants.
Two sets of gases are

I. O₂, CO₂, H₂ and He
II. CH₄, O₂, and H₂

The gases given in set- I increasing order of 'b' and gases given in set -II in decreasing order of 'a' are arranged below. Select the correct order from the following.

• (I) He < H₂ < CO₂ < O₂
  (II)  CH₄>  H₂> O₂

• (I) O₂ < He < H₂ < CO₂
  (II) H₂> O₂ > CH₄

• (I) O₂ < He < O₂ < CO₂
  (II) CH₄ > O₂ > H₂  

• (I) O₂ < He < O₂ < CO₂
  (II) CH₄ > O₂ > H₂  

Equal volumes of two monoatomic gases, A and B, at same temperature and pressure are mixed. The ratio of specific heats (C_p/C_v) of the mixture will be

• 0.83

• 1.50

• 3.3

• 3.3

A gaseous mixture was prepared by taking equal moles of CO and N₂, If the total pressure of the mixture was found 1 atmosphere, the partial pressure of the nitrogen (N₂) in the mixture is

• 0.8 atm

• 0.9 atm

• 1 atm

• 0.5 atm

If x is the amount of adsorbate and m is the amount of adsorbent, which of the following relations is not related to adsorption process?

• 

• p = f(T) at constant (x/m)

• 

• 

Two gases A and B having the same volume diffuse through a porous partition in 20 and 10 seconds respectively. The molecular mass of A is 49u. Molecular mass of B will be

• 12.25 u

• 6.50 u 

• 25.00 u

• 25.00 u

By what factor does the average velocity of a gaseous molecule increase when the temperature (in kelvin) is doubled?

• 2.8

• 4.0

• 1.4

• 1.4

In Duma's method of estimation of nitrogen 0.35 g of an organic compound gave 55 mL of nitrogen collected at 300 K temperature and 715 mm pressure. The percentage composition of nitrogen in the compound would be

(Aqueous tension at 300 k = 15 mm)

• 16.45

• 17.45

• 14.45

• 14.45