2.9 g of a gas at 95°C occupies the same volume as 0.184 g of dihydrogen at 17°C, at the same pressure. The molar mass of the gas is -
1. 20 g mol-1
2. 40 g mol-1
3. 34 g mol-1
4. 14 g mol-1
A mixture of dihydrogen and dioxygen at one bar pressure contains 20% by weight of dihydrogen. The partial pressure of dihydrogen is -
1. 0.2 bar
2. 0.7 bar
3. 0.8 bar
4. 0.6 bar
Van der Waals parameter 'a' signifies -
1.The magnitude of intermolecular attractive forces.
2. The magnitude of intermolecular repulsive forces.
3. The volume of a gas molecule.
4. All of the above.
A person living in Shimla observed that cooking food without using a pressure cooker takes more time. The reason for this observation is-
1. Pressure increases
2. Temperature decreases
3. Pressure decreases
4. Temperature increases
The spherical shape of rain droplets is due to-
1. Viscosity
2. surface tension
3. Critical phenomenon
4. Pressure
A plot of volume versus temperature (T) for a gas at constant pressure is a straight line passing through the origin. The plots at different values of pressure are shown in the figure given below.
The correct order of pressure is -
Temperature (K)
1.
2.
3.
4.
The interaction energy of London force is inversely proportional to sixth power of the distance between two interacting particles. Their magnitude depends upon-
1. Charge of interacting particles.
2. Mass of interacting particles.
3. Polarizability of interacting particles.
4. Strength of permanent dipoles in the particles.
Dipole-dipole forces act between the molecules possessing permanent dipole. Ends of dipoles possess 'partial charges'.
The partial charge will be-
1. More than unit electronic charge.
2. Equal to unit electronic charge.
3. Less than unit electronic charge.
4. Double the unit electronic charge.
The pressure of a 1 : 4 mixture of dihydrogen and dioxygen enclosed in a vessel is one atmosphere. The partial pressure of dioxygen is-
1.
2.
3.
4.
As the temperature increases, average kinetic energy of molecules increases. With increase in temperature at constant volume, the pressure -
1. Increases
2. Decreases
3. Remains same
4. Becomes half