21420.At 27°C a closed vessel contains equal weight of He, CH4 and SO2 exerts a pressure of 210 mm and partial pressures of He, CH4 and SO2 are P1, P2 and P3. Which one of the following is correct?
P3 > P2 > P1
P1 > P2 > P3
P1 > P3 > P2
P2 > P3 > P1
21421.In order to increase the volume of a gas by 10%, the pressure of the gas should be
increased by 10%
increased by 1%
decreased by 10%
decreased by 1%
21422.In a flask of ‘V’ litres, 0.2 moles of O2, 0.4 moles of N2, 0.1 moles of NH3 and 0.3 moles of He gases are present at 27°C. If total pressure exerted by these non–reacting gases is 1 atm, the partial pressure exerted by N2 gas is
0.4 atm
0.3 atm
0.2 atm
0.1 atm
21423.The total pressure of a mixture of 6.4 grams of oxygen and 5.6 grams of nitrogen present in a 2 litre vessel is 1200 mm. What is the partial pressure (in mm) of nitrogen?
1200
600
900
200
21424.In which one of the following, does the given amount of chlorine exert the least pressure in a vessel of capacity 1 dm3 at 273 K?
0.071 g
0.0355 g
0.02 mole
6.023 × 1021 molecules
21425.Equal masses of ethane and hydrogen are mixed in any empty container at 25°C. The fraction of total pressure exerted by hydrogen is
1: 2
1 : 1
1 : 16
15: 16
21426.Temperature below which, the gas does not obey ideal gas laws is called
Boyle's temperature
inversion temperature
reduced temperature
critical temperature
21427.The density of an ideal gas is 0.03 g cm–1. Its pressure is 106 g cm–1 s–2. What is its RMS velocity (in cm s–1)
103
3 × 104
108
104
21428.The density of O2 is 16 at NTP. At what temperature its density will be 14? Consider that the pressure remains constant.
50°C
39°C
57°C
43°C
21429.The kinetic energy of 4 moles of nitrogen gas at 127°C is _____ cals.
(R = 2 cal mole–1 K–1 )
(R = 2 cal mole–1 K–1 )
4400
3200
4800
1524
21430.The most probable velocity (in cm/s) of hydrogen molecule at 27°C, will be
19.3 × 104
17.8 × 104
24.93 × 109
17.8 × 108
21431.What is the ratio of kinetic energies of 3 g of hydrogen and 4 g of oxygen at T(K)?
12 : 1
6 : 1
1 : 6
24 : 1
21432.What is the temperature at which the kinetic energy of 0.3 moles of Helium is equal to the kinetic energy of 0.3 moles of Helium is equal to the kinetic energy of 0.4 moles of Argon at 400 K?
400 K
873 K
533 K
300 K
21433.The maximum number of molecules is present in:
5 L of N2 gas at STP
0.5 g of H2 gas
10 g of O2 gas
15 L of H2 gas at STP
21436.The volume of 10 moles of an ideal gas is 1 litre at 1 atm Pressure and temperature. What is the volume (in lit) of 20 moles of same gas at same temperature and pressure?
1
2
4
8
21437.For one mole of an ideal gas, increasing the temperature from 10°C to 20°C ______.
increases the rms velocity by $\sqrt{2}$ times.
increases the average kinetic energy by two times.
increases both the average kinetic energy and rms velocity, but not significantly.
increases the rms velocity by two times.
21438.138 grams of ethyl alcohol is mixed with 72 grams of water. The ratio of mole fraction of alcohol to water is
3 : 4
1 : 2
1 : 4
1 : 1
21439.To an evacuated vessel with movable piston under external pressure of 1 atm., 0.1 mol of He and 1.0 mol of an unknown compound (vapour pressure 0.68 atm. at 0°C) are introduced. Considering the ideal gas behaviour, the total volume (in litre) of the gases at 0°C is close to
7
9
13
15