Q. No.In water-saturated air, the mole fraction of water vapor is 0.02. If the total pressure of the saturated air is 1.2 atm, the partial pressure of dry air is-
1. 1.17 atm
2. 1.76 atm
3. 1.27 atm
4. 0.98 atm
The volume occupied by 1.8 g of water vapour at 374 and 1 bar pressure will be -
[Use R=0.083 bar ]
1. 96.66 L
2. 55.87 L
3. 3.10 L
4. 5.31 L
A gas at 350 K and 15 bar has a molar volume 20 percent smaller than that for an ideal gas under the same conditions. The correct option about the gas and its compressibility factor (Z) is:
| 1. | Z<1 and repulsive forces are dominant. |
| 2. | Z>1 and attractive forces are dominant. |
| 3. | Z>1 and repulsive forces are dominant. |
| 4. | Z<1 and attractive forces are dominant. |
A mixture of and Ar gases in a cylinder contains 7 g of and 8 g of Ar. If the total pressure of the mixture of the gases in the cylinder is 27 bar, the partial pressure of is:
[Use atomic masses (in g ): N=14, Ar=40]
1. 12 bar
2. 15 bar
3. 18 bar
4. 9 bar
The minimum pressure required to compress 600 dm3 of a gas at 1 bar to 150 dm3 at 40°C is
1. 4.0 bar
2. 0.2 bar
3. 1.0 bar
4. 2.5 bar
Choose the correct option for graphical representation of Boyle's law, which shows a graph of pressure vs. volume of a gas at different temperatures:
| 1. |  |
| 2. |  |
| 3. |  |
| 4. |  |
The correct option for the total pressure (in atm) in a mixture of 4 g O2 and 2 g H2 confined in a total volume of one liter at 0C is :
[Given R=0.082 L atm mol-1 K-1, T=273 K]
1. 25.18
2. 26.02
3. 2.518
3. 2.602
(Here p = total pressure of a gaseous mixture)
| 1. | \(p_i=\chi_ip^o_i,\) where \(\chi_i=\) mole fraction of \(i^\text{th}\) gas in a gaseous mixture \(p_{i}^{o}=\) pressure of \(i^\text{th}\) gas in a pure state |
| 2. | \(\mathrm{p}=\mathrm{p}_{1}+\mathrm{p}_{2}+\mathrm{p}_{3} \) |
| 3. | \(\mathrm{p}=\mathrm{n}_{1} \frac{\mathrm{RT}}{\mathrm{V}}+\mathrm{n}_{2} \frac{\mathrm{RT}}{\mathrm{V}}+\mathrm{n}_{3} \frac{\mathrm{RT}}{\mathrm{V}}\) |
| 4. | \(\mathrm{p}_{i}=\chi_{i} \mathrm{p} \), where \(\mathrm{p}_{i}=\) partial pressure of \(i^\text{th}\) gas \(\chi_i=\) mole fraction of \(i^\text{th}\) gas in a gaseous mixture |
(Given R = 0.0831 L bar K-1 mol-1)
1. 4.9
2. 2.5
3. 498.6
4. 49.8
Which of the following is not correct about postulates of the kinetic molecular theory of gases?
| 1 . | Pressure of the gas is due to the collision of molecules against the walls of the container. |
| 2. | Volume of the gas is due to the large number of molecules of the gas. |
| 3. | Average kinetic energy of molecules is directly proportional to the absolute temperature of the gas. |
| 4. | The molecules move randomly with different speeds in different directions. |
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