A certain volume of argon gas (Mol. wt. = 40) requires 45 s to effuse through a hole at a certain pressure and temperature. The same volume of another gas of unknown molecular weight requires 60s to pass through the same hole under the same conditions of temperature and pressure. The molecular weight of the gas is

(1) 53                                 

(2) 35

(3) 71                                 

(4) 120

Which of the following curves does not represent Boyle's Law

(1) 

(2) `

(3) 

(4) 

The ratio of average molecular kinetic energy of ${\mathrm{UF}}_6$ to that of ${\mathrm{H}}_2$, both at 300 K is$-$

(1) 1 : 1                       

(2) 7 : 2

(3) 176 : 1                   

(4) 2 : 7

X ml of ${\mathrm{H}}_2$ gas effuses through a hole in a container in 5 seconds. The time taken for the effusion of the same volume of the gas specified below under ideal condition is

(1) 10 seconds : $\mathrm{He}$                          

(2) 20 seconds : ${\mathrm{O}}_2$

(3) 25 seconds : $\mathrm{CO}$                          

(4) 55 seconds : ${\mathrm{CO}}_2$

The valves X and Y are opened simultaneously. The white fumes of ${\mathrm{NH}}_4\mathrm{Cl}$ will first form at :

(1) A                                                 

(2) B

(3) C                                                 

(4) A, B and C simultaneously

A gas mixture consists of 2 moles of oxygen and 4 moles of a argon at temperature T. Neglecting all vibrational modes, the total internal energy of the system is –

(1) 4RT                         

(2) 5RT

(3) 15RT                       

(4) 11RT

Two flasks of equal volume are connected by a narrow tube (of negligible volume) at 27ºC and contain 0.70 mole of ${\mathrm{H}}_2$ at 0.5 atm. One of the flasks is then immersed in a hot bath, kept at 127 ºC, while the other remains at 27 ºC. The final pressure is -

1. 5.714 atm                   

2. 0.5714 atm

3. 2.5214 atm                 

4. 5.5114 atm

Which is not correct curve for gay-lusacc's law?

1 .  

2.     

3.   

4.     

In two vessels of 1 litre each at the same temperature 1 g of ${\mathrm{H}}_2$ and 1 g of ${\mathrm{CH}}_4$ are taken, for these:

1.  ${\mathrm{V}}_{\mathrm{rms}}$ values will be same

2.  Kinetic energy per mol will be same

3.  Total kinetic energy will be same

4.  Pressure will be same

 The van der Waals parameters for gases W, X, Y and Z are

Which one of these gases has the highest critical temperature?

1.  W

2.  X

3.  Y

4.  Z