The compressibility factor for H₂ and He is usually:

(1) >1                                     

(2) =1

(3) <1                                     

(4) either of these

In van der Waals' equation of state of the gas, the constant 'b' is a measure of:

(a) intermolecular collisions per unit volume

(b) intermolecular attraction

(c) volume occupied by molecules

(d) intermolecular repulsions

Which curve does not represent Boyle's law?

At which one of the following temperature pressure conditions, the deviation of a gas from ideal behaviour is expected to be minimum?                                     

(1) 350 K and 3 atm                   

(2) 550 K and 1 atm

(3) 250 K and 4 atm                   

(4) 450 K and 2 atm

Select the correct statement. In the gas equation PV = nRT                 

(1) n is the number of molecules of a gas

(2) V denotes the volume of 1 mole of the gas

(3) n moles of the gas have a volume V

(4) p is the pressure of the gas when only one mole of the gas is present

The ratio among most probable velocity, mean velocity and root mean square velocity is given by

(a) 1:2:3                           (b) 1: $\sqrt{2}:\sqrt{3}$

(c) $\sqrt{2}:\sqrt{3}:\sqrt{\frac{8}{\pi }}$                (d) $\sqrt{2}:\sqrt{\frac{8}{\pi }}:\sqrt{3}$

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

Joule-Thomson coefficient ($\partial \mathrm{T}/\partial \mathrm{P}$)_H for an ideal gas is:

(a) zero                                  (b) +ve

(c) -ve                                    (d) none of these

The unit of van der Waals' constant 'b' is -

1. cm³ mol^-1

2. litre mol^-1

3. m³ mol^-1

4. All of the above

Boyle's law is applicable in :

(1) isobaric process

(2) isochoric process

(3) isothermal process

(4) adiabatic process