Select the correct statement. In the gas equation pV= nRT
n is the number of molecules of a gas
v denotes volume of one mole of the gas
n moles of the gas have a volume V.
P is the pressure of the gas when only one mole of the gas is present.
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
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
Under what conditions will a pure sample of an ideal gas not only exhibit a pressure of 1 atm but also a concentration of 1mol L-1? (R= 0.082 L atm mol-1 deg-1).
At STP
When V= 22.4L
When T= 12K
Impossible under any conditions
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
The appearance of colour in solid alkali metal halides is generally due to
F- centres
Schottky defect
Frenkel defect
Interstitial positions
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
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
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
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.