States of Matte...

The surface tension of which of the following liquids is the maximum?

The vapor pressure of different substances at the same temperature increases if

Dipole-dipole forces act between the molecules possessing permanent dipole. Ends of dipoles possess ‘partial charges’. The partial charge is

The enthalpies of vaporisation of H₂O, C₂H₅OH and CS₂ are 40.6, 38.6 and 26.8 kJ/mol, respectively. The decreasing order of intermolecular forces in these liquids is:

A student forgot to add the reaction mixture to the round bottomed flask at 27 °C , but instead he/she placed the flask on the flame. After a lapse of time, he realized his mistake, and using a pyrometer he found the temperature of the flask was 477 °C. What fraction of air would have been expelled out?

Consider the following graph.



Which of the following statements is wrong?

What will be the minimum pressure required to compress 500 dm3of air at 1 bar to 200 dm3at 30°C?

Dipole–induced dipole interactions are present in which of the following pairs?

The interaction energy of London force is inversely proportional to sixth power of the distance between two interacting particles, but their magnitude depends upon

Which of the following substances, when dissolved in water, increases the surface tension of water?

For hydrogen gas, the values of Van der Waals constants 'a' and 'b' are 0.245 atm litre² mol^-2 and 0.026 litre mol^-1, respectively. Calculate the volume of 1 mol of hydrogen at 5 atm and 0^oC.

Which of the following properties of water can be used to explain the spherical shape of rain droplets?

Calculate the weight of CH₄ in a 9 litre cylinder at 16 atm and 27^oC.
(R = 0.08 L atm/K)

What is the dominate intermolecular force that must be overcome in converting liquid CH₃OH into gas?

In order to increase the volume of a gas by 10%, the pressure of the gas should be

100 ml of a gas diffuses in the same time as 75 ml of ammonia at 30^oC and 743 torr. What is the molecular mass of the gas?

For a Van der Waals gas, the expression for Boyle's temperature is

What will happen to the volume of a bubble of air found under water in a lake, where the temperature is 15^oC and the pressure is 1.5 atm, if the bubble rises to the surface where the temperature is 25^oC and the pressure is 1.0 atm?

If 10^-4 dm³ of water is introduced into a 1.0 dm³ flask at 300 K, then how many moles of water are in the vapour phase when the equilibrium is established?

(Given: Vapour pressure of H₂O at 300 K is 3170 Pa and R = 8.314 J K^-1 mol^-1)

The van der Waals Equation adjusts the measured volume

The van der Waals Equation adjusts the measured pressure

The interaction energy of London force is inversely proportional to sixth power of the distance between two interacting particles but their magnitude depends upon

68 ml of a sample of nitrogen is collected over water at 20^oC and 700 mm of Hg. The volume of dry nitrogen at STP is
[The aq. tension of water is 17.5 mm of Hg at 20^oC.]

A person living in Shimla observed that cooking food without using pressure cooker takes more time. The reason for this observation is that at high altitude:

A gas in outer space is at a pressure of 5 x 10^-14 torr. When the temperature is constant, how much outer space could you compress into 1 dm³ box at 1 atmosphere?

An open vessel at 37^oC is heated until 3/5 of the air in it has been expelled. Assuming that the volume of the vessel remains constant, the temperature to which the vessel is heated is

Which of the following property of water can be used to explain the spherical shape of rain droplets?

Equal weights of ethane and hydrogen are mixed in an empty container at 25^oC. Determine the fraction of total pressure exerted by hydrogen.

Choose the incorrect statement.

As the temperature increases, average kinetic energy of molecules increases. What would be the effect of increase of temperature on pressure provided the volume is constant?