If a gas expands at constant temperature, it indicates that
kinetic energy of molecules decreases
pressure of the gas increases
kinetic energy of molecules remains the same
number of the molecules of the gas increases.
The temperature of the gas is raised from 27oC to 927oC, the root mean square velocity is
times of the earlier value
same as before
halved
doubled
500 ML of nirogen at 27oC is cooled to -5oC at the same pressure. The new volume becomes
326.32 mL
446.66mL
546.32mL
771.56mL
Which one of the following is wrong statement for gases?
Gases do not have a definite shape and volume
Volume of the gas is equal to volume of container confining the gas
Confined gas exerts uniform pressure on the walls of its container in all directions.
Mass of gas can not be determined by weighing a container in which it is enclosed.
The number of atoms contained in a fcc unit cell of a monoatomic substance is
1
2
4
6
At STP, 0.50 mole H2 gas and 1.0 mole He gas
have equal average kinetic energies
have equal molecular speeds
occupy equal volumes
have equal effusion rates
The pyknometric density of sodium chloride crystal is 2.165x103kg m-3. While its X -ray density is 2.178 x103 kgm-3. The fraction of unoccupied sites in sodium chloride crystal is
5.96x10-1
5.96x10-3
5.96
5.96x10-2
Which is not true in case of ideal gas?
It can not be converted into a liquid
There is no interaction between the molecules
All molecules of the gas move with same speed
At a given temperature, pV is proportional to the amount of gas.
Van der waals' real gas, act as an ideal gas, at which condition?
High temperature, low pressure
Low temperature, high pressure
High temperature, high pressure
Low temperature, low pressure
A pure crystalline substance on being heated gradually first forms a turbid liquid at constant temperature and still at higher temperature turbidity completely disappears. The behaviour is a characteristic of substance forming
allotropic crystals
liquid crystals
isomeric crystals
isomorphous crystals
