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

The correct value of the gas constant 'R' is close to 

(a) 0.082 L atm K

(b) 0.082 L atm K^-1 mol^-1

(c) 0.082 L atm^-1 K mol^-1

(d) 0.082 L^-1 atm^-1 K mol

The number of molecules present in 1 mL of gas or vapour at STP is:

(1) called Loschmidt's number

(2) equal to 2.617 x 10¹⁹ per mL

(3) both (a) and (b)

(4) none of the above

600 cc of a gas at a pressure of 750 mm is compressed to 500 cc. Taking the temperature to remain constant, the increase in pressure is                                           

(a) 150 mm                       (b) 250 mm

(c) 350 mm                       (d) 450 mm

An ideal gas expands according to PV=constant. On expansion, the temperature of gas:

(1) will rise

(2) will drop

(3) will remain constant

(4) cannot be determined because the external pressure is not known