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 root mean square speeds at STP for the gases H2,N2, O2 and HBr are in the order.
H2 < N2 < O2 < HBr
HBr < O2 < N2 < H2
H2 < N2 = O2 < HBr
HBR < O2 < H2 < N2
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.
Root mean square velocity of a gas molecule is proportional to
m1/2
m0
m-1/2
m
A gas is said to behave like an ideal gas when the relation PV / T = constant. When do you expert a real gas to behave like an ideal gas?
When the temperature is low
When both the temperature and pressure are low
When both the temperature and pressure are high
When the temperature is high and pressure is low.
600cc of a gas at a pressure of 750 mm is compressed tp 500cc. Taking the temperature to remain constant, the increase in pressure is ,
150mm
250mm
350mm
450mm
The intermettalic compound LiAg crystallises in cubic lattice in which both lithium and silver have coordination number of eight. The crystal class is
Simple cube
Body centred cube
Face centred cube
None of these
The edge length of a centred unit cubic cell is 508 pm. If the radius of the cation is 100pm, the radius of the anion is
288 pm
398 pm
154 pm
618 pm
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.
