371.

At relatively high pressure, vander Waal's equation reduces to:

• pV=RT

• pV=RT$-\frac{\mathrm{a}}{\mathrm{V}}$

• pV=RT$-\frac{\mathrm{a}}{{\mathrm{V}}^2}$

• pV=RT+pb

Which of the following is not a property of liquid state ?

• Intermolecular force of attraction in a liquid is quite large

• All liquids accompanied by cooling on evaporation

• Lower the boiling point of a liquid, greater is its vapour pressure at room temperature

• A liquid boils at high temperature at the top of a mountain than at the sea level

As the temperature is raised from 20°C to 40C, the average kinetic energy of neon atoms changes by a factor:

• $\frac{313}{293}$

• $\sqrt{\left(\frac{313}{293}\right)}$

• $\frac{1}{2}$

• 2

A certain sample of gas has a volume of 0.2 L measured at 1 a:tm pressure and 0°C. At the same pressure but 273°C, its volume will be :

• 0.4 L

• 0.8 L

• 27.8 L

• 55.6 L

Ratio of molecular weights of A and B is $\frac{4}{25}$ then ratio of rates of diffusion will be

• 5 : 1

• 5 : 2

• 25 : 3

• 25 : 4

a/ V² given in van der Waal's equation is for

• internal pressure

• inter molecular attraction

• both (1) and (2)

• temperature correction

When the temperature of an ideal gas is increased from 27°C to 927°C, the kinetic energy will be

• same

• eight times

• four times

• twice

When a bottle of dry ammonia and a dry hydrogen chloride are connected through a long tube and stoppers at both ends of the tube are opened simultaneously. The white ammonium chloride ring first formed will be:

• at the centre of the tube

• near the hydrogen chloride bottle

• near the ammonia bottle

• throughout the length of the tube

Volume of CO₂ obtained from complete decomposition of 20 g CaCO₃ at STP is

• 2.24 litre

• 4.48 litre

• 20 litre

• 22.4 litre

Nitrogen (N₂) is in equilibrium state at T = 421K. The value of most probable speed Vmp is:

• 400 m/s

• 421 m/s

• 500 m/s

• 600 m/s