A compound formed by elements A and B crystallises in the cubic structure, where A atoms are present at the corner of a cube and B atoms are present at the face centres. The formula of the compound is
A2B2
AB3
AB
A3B
A liquid can exists only
between triple point and critical temperature
at any temperature above the melting point
between melting point and critical temperature
between boiling and melting temperature
Internal energy and pressure of a gas per unit volume are related as
P= 2/3 E
P= 3/2E
P=1/2 E
P= 2E
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
Cyclopropane and oxygen at partial pressures 170 Torr and 570 Torr are mixed in a gas cylinder. What is the ratio of the number of moles of cyclopropane to the number of moles of oxygen?
170x42 / 570x32 = 0.39
170 / 740 = 0.23
170 / 570 = 0.30
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.
Zn converts from its melted state to its solid state, it has hcp structure, then find out the number of nearest atoms.
6
8
12
4
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
With which one of the following elements silicon should be doped so as to give p- type of semiconductor?
Germanium
Arsenic
Selenium
Boron
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
