At room temperature, the average speed of Helium is higher than that of Oxygen by a factor of -
1.
2.
3. 8
4. 6
Van der Waals equation at low pressure is -
1. PV = RT - Pb
2. PV = RT -
3. PV = RT +
4. PV = RT + Pb
The unit of van der Waals' constant 'b' is -
1. cm3 mol-1
2. litre mol-1
3. m3 mol-1
4. All of the above
In which case is the rate of diffusion highest if all are present in the same container at the same temperature:
1. 4 g H2
2. 32 g O2
3. 22 g CO2
4. 56 g N2
At high pressure, the compressibility factor 'Z' is equal to -
1. Unity
4. Zero
20 L of SO2 diffuses through a porous partition in 60s. The volume of O2 that will diffuse under similar condition in 30s will be:-
1. 12.14 L
2. 14.14 L
3. 18.14 L
4. 28.14 L
The compressibility factor for 1 mol of a van der Waals gas at and 100 atmospheric pressure is found to be 0.5. The volume of gas is-
1. 2.0224 L
2. 1.4666 L
3. 0.8542 L
4. 0.1119 L
A helium atom is two times heavier than a hydrogen molecule. At 298 K, the average kinetic energy of a helium atom is-
1. Same as that of a hydrogen molecule
2. Half that of a hydrogen molecule
3. Two times that of a hydrogen molecule
4. Four times that of a hydrogen molecule
A 2.24 L cylinder of oxygen at STP is found to develop a leakage. When the leakage was plugged, the pressure dropped to 570 mm of Hg. The number of moles of gas that escaped will be:
1. 0.050
2. 0.025
3. 0.075
4. 0.01
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