A solution has a 1 : 4 mole ratio of pentane to hexane. The vapour pressures of the hydrocarbons at 20C are 400 mm Hg for pentane and 120 mm hg for hexane. The mole fraction of pentane in the vapour phase would be
1. 0.200
2. 0.549
3. 0.454
4. 0.478
The temperature at which rate of diffusion of would be 1.625 times the rate of diffusion of
1. 110 K
2. 173 K
3. 373 K
4. 273 K
If Vrms of m/s. What is the value of Vrms of at 1200K?
1. 1.9
2. 3.8 m/s
3. 0.475 m/s
4. 0.95 m/s
The average velocity of ideal gas molecules at 27 is 0.3 m/sec. The average velocity at 927 will be
1. 0.6 m/sec
2. 0.3 m/sec
3. 0.9 m/sec
4. 3.0 m/sec
equal masses of methane and hydrogen are mixed in an empty container at The fraction of the total pressure exerted by hydrogen is
1. 1/2
2. 8/9
3. 1/9
4. 16/17
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
Distribution of fraction of molecules with velocity is represented in the figure.
The velocity corresponding to point X is
1.
2.
3.
4. none of the above
A ballon having weight 50 kg is filled with 685.2 kg of helium gas at 760 mm pressure and . What will be its pay load if it displaces 5108 kg of air?
1. 4372.8 kg
2. 4392.6 kg
3. 4444.4 kg
4. 3482.9 kg
For non-zero value of force of attraction between gas molecules for larger volume, gas equation will be
1.
2.
3.
4. PV = nRT
Four rubber tubes are respectively filled with . Which tube will be reinflated first?
1. filled tube
2. filled tube
3. He filled tube
4. filled tube