Most crystals show good cleavage because their atoms, ions or molecules are
weakly bonded together
strongly bonded together
spherically symmetrical
arranged in planes
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
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 appearance of colour in solid alkali metal halides is generally due to
Interstitial positions
At which one of the following temperature pressure conditions, the deviation of a gas from ideal behavior is expected to be minimum?
350 k and 3 atm
550 k and 1 atm
250k and 4 atm
450 k and 2 atm
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
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.
At 25oC and 730 mm pressure, 380mL of dry oxygen was collected. If the temperature is constant, what volume will the oxygen occypy at 760mm pressure?
365mL
2g
10g
20g
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