A bubble of air is underwater at a temperature15°C and the pressure 1.5 bar. If the bubble rises to the surface where the temperature is 25°C and the pressure is 1.0 bar, what will happen to the volume of the bubble?
1. Volume will become greater by a factor of 2.5
2. Volume will become greater by a factor of 1.6
3. Volume will become greater by a factor of 1.1
4. Volume will become smaller by a factor of 0.70
The pressure exerted by 6.0 g of methane gas in a 0.03 m3 vessel at 129 ºC is:
(Atomic masses : C = 12.01, H = 1.01 and R = 8.314 JK–1mol–1)
1. 13409 Pa
2. 41648 Pa
3. 31684 Pa
4. 215216 Pa
For real gases van der Waals equation is written as
where 'a' and 'b' are van der Waals constants.
Two sets of gases are:
(I) (II)
The gases given in set-I are in increasing order of 'b' and gases given in set-II are in decreasing order of 'a'. Select the correct order from the following:
1.
2.
3.
4.
A certain gas takes three times as long to effuse out as helium. Its molecular mass will be:
1. 36 u
2. 64 u
3. 9 u
4. 27 u
If a gas expands at a constant temperature, it indicates that:
1. Kinetic energy of the molecules decreases
2. The pressure of the gas increases
3. The kinetic energy of the molecules remains the same
4. The number of molecules of gas increases
The energy absorbed by each molecule (A2) of a substance is 4.4 x 10-19 J and bond energy per molecule is 4.0 x 10-19 J. The kinetic energy of the molecule per atom will be:
1.
2.
3.
4.
By what factor does the average velocity of a gaseous molecule increase when the temperature (in Kelvin) is doubled?
1. 2.8
2. 4.0
3. 1.4
4. 2.0
1. 12.25 U
2. 6.50 U
3. 25.00 U
4. 50.00 U
1. 0.8 atm
2. 0.9 atm
3. 1 atm
4. 0.5 atm