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 surface tension of which of the following liquids is maximum?
H2O
C6H6
CH3OH
C2 H5OH
If p, V, M, T and R are pressure, volume, molar mass, temperature and gas constant respectively, then for an ideal gas, the density is given by,
RT/ PM
P/RT
M/V
PM/RT
Pressure remaining the same the volume of a given mass of an ideal gas increases for every degree centrigrade rise in temperature by definite fraction of its volume at
0oC
Absolute zero
Its critical temperature
Its Boyle's temperature
With which one of the following elements silicon should be doped so as to give p- type of semiconductor?
Germanium
Arsenic
Selenium
Boron
The beans are cooked earlier in pressure cooker, because
b.p increases with increasing pressure.
b.p decreases with increasing pressure.
extra pressure of pressure cooker, softens the beans.
internal energy is not lost while cooking in pressure cooker.
When is the deviation is more in the behaviour of a gas from the ideal gas equation pV= nRT?
At high temperature and low pressure
At low temperature and high pressure
At high temperature and high pressure
At low temperature and low pressure
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
A closed flask contains water in all its three states solid, liquid and vapour at 0oC. In this situation, the avearage kinetic energy of water molecules will be
the greatest in all the three states
the greatest in vapour state
the greatest in the liquid state
the greatest in the solid state
When electrons are trapped into the crystalline anion vacancy, the defect is known as
Schottky defect
Stoichiometric defect
Frenkel defect
F- centres
