The van der Waal's constant 'b' for N2 and H2 has the values 0.039 lit moil–1 and 0.0266 lit mo1–1. The density of solid N2 is 1 g cm–3. Assuming the molecules in the solids to be close packed with the same percentage void, the density of solid H2 would be (in g cm–3)
(1) 0.114
(2) 0.682
(3) 1.466
(4) 0.071
A certain gas effuses out of two different vessels A and B. A has a circular orifice while B has a square orifice of length equal to the radius of the orifice of vessel A. The ratio of rate of diffusion of the gas from vessel A to that from vessel B is
(1) π : 1
(2) 1 : π
(3) 1 : 1
(4) 3 : 2
A sample of a given mass of a gas at a constant temperature occupies 95cm3 under a pressure of . At the same temperature, the volume at a pressure of is [Bihar CEE 1992]
1. 190 cm3
2. 93 cm3
3. 46.5 cm3
4. 47.5 cm3
A gas occupied a volume of 250 ml at 700 mm Hg pressure and 25°C. An additional pressure is required to reduce the gas volume to its 4/5th value at the same temperature is-
1. 225 mm Hg
2. 175 mm Hg
3. 150 mm Hg
4. 265 mm Hg
At constant temperature, if pressure increases by 1%, the percentage decrease of volume is-
1. 1%
2. 100/101%
3. 1/101%
4. 1/100%
When the temperature of 23 ml of dry CO2 gas is increased from 10° to 30°C at a constant pressure of 760 mm, the volume of gas becomes-
1. 7.7 ml
2. 25.5 ml
3. 24.6 ml
4. 69 ml
The volume of a gas is 100 ml at 100°C. If the pressure remains constant then the temperature at which the volume becomes 200 ml is-
1. 200°C
2. 473°C
3. 746°C
4. 50°C
If 300 ml of a gas at 27°C is cooled to 7°C at constant pressure, its final volume will be:
1. | 135 ml | 2. | 540 ml |
3. | 350 ml | 4. | 280 ml |
A flask containing air (open to atmosphere) is heated from 300 K to 500 K. The percentage of air escaped to the atmosphere is nearly-
1. 16.6
2. 40
3. 66
4. 20
According to Charle’s law, at constant pressure, 100 ml of a given mass of a gas with 10°C rise in temperature will become ,T initial = Zero °C
1. 100.03
2. 99.96
3. 103.66
4. 100.36