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.
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
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
50 mL of each gas A and of gas B takes 200 and 150 s respectively for effusing through a pinhole under the similar conditions. If the molecular mass of gas B is 36, the molecular mass of gas A will be:
1. 96
2. 128
3. 32
4. 64
Equal masses of H2, O2 and CH4 have been taken in a container of volume V at temperature 27 ºC in identical conditions. The ratio of the volumes of gases H2:O2 : CH4 would be:
1. 8:16:1
2. 16:8:1
3. 16:1:2
4. 8:1:2
A gas such as carbon monoxide would be most likely to obey the ideal gas law at?
1. High temperature and low pressure
2. Low temperature and high pressure
3. High temperature and high pressure
4. Low temperature and low pressure
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