CBSE
Multiple Choice QuestionsFor molecules of a gas have speeds 1, 2, 3 and 4 km/s. The value of the root mean square speed of the gas molecules is
2.5 km/s
Determine the mean free path of argon molecules under normal condition knowing that the molecule diameter is 0.4 nm.
48 nm
60 nm
52 nm
71 nm
One mole of an ideal monoatomic gas is heated at a constant pressure from 0°C to 100°C. Then the change in the internal energy of the gas is (Given, R = 8.32 J mol-1 K-1)
0.83 × 103 J
4.6 × 103 J
2.08 × 103 J
1.25 × 103 J
Six molecules speeds 2 unit, 5 unit, 3 unit, 6 units, 3 unit and 5 unit respectively. The rms speed is
4 unit
1.7 unit
4.2 unit
5 unit
Volume versus temperature graphs for a given mass of an ideal gas are shown in figure. At two different values of constant pressure, what can be inferred about relation between p1 and p2 ?
p1 > p2
p1 = p2
p1 < p2
data is insufficient
At what temperature will the rms speed of air molecules be double that NTP ?
519° C
619° C
719° C
819° C
The rms speed of oxygen is v at a particular temperature. If the temperature is doubled and oxygen molecules dissociate into oxygen atoms, the rms speed becomes
v
2 v
4 v
The equation of state for n moles of an ideal gas is pV = nRT, where R is a constant. The SI unit for R is
Jk-1 per molecule
JK-1 mol-1
JKg-1K-1
Jk-1g-1
