For a real gas, PV is a constant over a small range of pressures at-
1. Boyle’s temperature
2. Critical temperature
3. Inversion temperature
4. Ordinary temperature
A vessel of volume contains a mixture of hydrogen and helium at 20°C and 2 atm pressure. The mass of the mixture is 5 g. The ratio of the mass of hydrogen to that of helium in the mixture, is -
1. 1:2
2. 1:3
3. 2:3
4. 3:2
The pressure-volume plot for an ideal gas at a given temperature has the form of a -
1. Straight line
2. Exponential curve
3. Rectangular hyperbola
4. U-shaped curve
Flask X is filled with 20 g of gas at 100 °C and another identical flask Y with 40 g gas at the same temperature. The correct statement among the following is –
1. The pressure of the gases in the two flasks is identical
2. The pressure of in flask X is higher than that of in flask Y
3. The pressure of in flask X is lower than that of in flask Y
4. The pressure of in flask X is half that of in flask Y
Choose the correct statement for viscosity () variation with T and P for an ideal gas-
1. of a gas increases with increase in temperature (T), but it is independent of pressure
2. of a gas decreases with increase in T and increases with increase in P
3. of a gas is independent of temperature and pressure
4. of a gas increases with increase in both T and P
Oxygen is present in 1-litre flask at a pressure of mmHg.The number of oxygen molecules in the flask at is -
1.
2.
3.
4.
Two flasks of equal volume are connected by a narrow tube (of negligible volume) at 27ºC and contain 0.70 mole of at 0.5 atm. One of the flasks is then immersed in a hot bath, kept at 127 ºC, while the other remains at 27 ºC. The final pressure is -
1. 5.714 atm
2. 0.5714 atm
3. 2.5214 atm
4. 5.5114 atm
A certain hydrate has the formula . A quantity of 54.2 g of the compound is heated in an oven to drive off the water. If the water vapour generated exerts a pressure of 24.8 atm in a 2.0 L container at 120, the value of x is-
1. 2
2. 5
3. 6
4. 7
The correct order of temperature of a real gas is-
I. Boyle's temperature
II. Critical temperature
III. Inversion temperature
1. III > I > II
2. I > II > III
3. II > I > III
4. I > III > II
A mixture of He and Ar weighting 5.0 g occupies a volume of and 1 atm pressure. The composition of the mixture is respectively -
1. 70%, 30%
2. 25%,75%
3. 75%,25%
4. 40%,60%