Q.1.
A 1:1 mixture (by weight) of hydrogen and helium is enclosed in a one litre flask kept at 0°C. Assuming ideal behaviour, the partial pressure of helium is found to be 0.42 atm. Then the concentration of hydrogen would be
-
29%
a) 0.0375 M
-
14%
b) 0.028 M
-
57%
c) 0.0562 M
-
0%
d) 0.0187 M
Explanation
Q.2.
The density of methane at 2.0 atmosphere pressure and 27°C is :... [ BHU 1994]
-
0%
a) 0.13 gL-1
-
40%
b) 0.26 gL-1
-
60%
c) 1.30 gL-1
-
0%
d) 26.0 gL-1
Explanation
Q.3.
3.2g of oxygen (at. wt=16) and 0.2g of hydrogen (at.wt=1) are placed in a 1.12litre flask at 0°C. The total pressure of the gas mixture will be ... [ CBSE PMT 1992]
-
0%
a) 1 atm
-
67%
b) 4 atm
-
17%
c) 3 atm
-
17%
d) 2 atm
Explanation
Q.4.
A gaseous mixture contains 56 g of N2, 44 g of CO2, and 16 g of CHTotal pressure of the mixture is 720 mmHg. The partial pressure of CH4 is ....[ EAMCET 1991]
-
20%
a) 180 mm
-
60%
b) 360 mm
-
20%
c) 540 mm
-
0%
d) 720 mm
Q.5.
According to Charle's law, at constant pressure, 100 ml of given mass of a gas with 10°C rise in temperature will become ( 1/273=0.00366)
-
0%
a) 100.0366
-
40%
b) 99.9634
-
40%
c) 103.66
-
20%
d) 100.366
Explanation
Q.6.
The volume of 0.0168 mol of O2 obtained by decomposition of KCl3 and collected by displacement of water is 428 ml at a pressure of 754mmHg at 25°C. The pressure of water vapour at 25°C is [ UP SEAT 1996]
-
20%
a) 18 mmHg
-
20%
b) 20 mmHg
-
40%
c) 22 mmHg
-
20%
d) 24 mmHg
Explanation
Q.7.
The density of gas at 27°C and 1 atm is d. Pressure remains constant at which of the following temperatures will its density become 0.75d?
-
0%
a) 20°C
-
20%
b) 30°C
-
60%
c) 400K
-
20%
d) 300K
Explanation
Q.8.
0.5 mole each of H2, SO2, CH4 are kept in a container. A hole was made in the container. After 3 hours, the order of partial pressure in the container will be
-
20%
a)
-
0%
b)
-
60%
c)
-
20%
d)
Q.9.
The number of moles of H2 in 0.224 litre of hydrogen gas at STP ( 273K, 1atm) is .. [ MLNR 1994]
-
0%
a) 1
-
0%
b) 0.1
-
60%
c) 0.01
-
40%
d) 0.001
Q.10.
Weather balloon filled with hydrogen at 1 atm and 27°C has volume equal to 12000 litres. One ascending it reaches a place where temperature is -23°C and pressure is 0.5 atm. The volume of the balloon is ... [ CBSE PMT 1991]
-
17%
a) 24000 litres
-
50%
b) 20,000 litres
-
17%
c) 10,000 litres
-
17%
d) 12,000 litres
Explanation
Q.11.
A certain sample of gas has a volume of 0.2 litre measured at 1 atm. pressure and 0°C. At the same pressure but at 273°C, its volume will be .. [ EAMCET 1993]
-
20%
a) 0.4 litre
-
20%
b) 0.8 litre
-
60%
c) 27.8 litres
-
0%
d) 55.6 litres
Q.12.
The rate of diffusion of gas having molecular weight just double of nitrogen gas is 56ml/s. The rate of diffusion of nitrogen will be .... [ CPMT 2000]
-
33%
a) 79.19 ml/s
-
33%
b) 112.0 ml/s
-
17%
c) 56 ml/s
-
17%
d) 90.0 ml/s
Explanation
Q.13.
At what temperature in the celsius scale, V ( volume ) of a certain mass of gas at 27°C will be doubled keeping the pressure constant? [ Orissa 1993]
-
60%
a) 54°C
-
20%
b) 327°C
-
20%
c) 427°C
-
0%
d) 527°C
Explanation
Q.14.
A sample of O2 gas is collected over water at 23°C at a barometric pressure of 751 mmHg ( vapour pressure of water at 23°C is 21mm Hg) The partial pressure of O2 gas in the sample collected is ... [ CBSE PMT 1993]
-
20%
a) 21 mmHg
-
40%
b) 751 mmHg
-
20%
c) 0.96 atm
-
20%
d) 1.02 atm
Q.15.
One litre of a gas weighs 2g at 300K and 1atm pressure If the pressure is made 0.75atm, at which of the following temperatures will one litre of same gas weigh one gram? [ CBSE PMT 1992]
-
0%
a) 450 K
-
60%
b) 600 K
-
20%
c) 800 K
-
20%
d) 900 K
Explanation
Q.16.
Weather balloon filled with hydrogen at 1atm and 27°C has volume equal to 1200 litres. On ascending it reaches a place where temperature is -23°c and pressure is 0.5atm. The volume of the balloon is ... [ CBSE PMT 1991]
-
0%
a) 24,000 liters
-
80%
b) 20,000 litres
-
20%
c) 10,000 litres
-
0%
d) 12,000 litres
Explanation
Q.17.
If pressure becomes double at the same absolute temperature on 2L CO2, the volume of CO2 becomes ... [ AIIMS 1992]
-
20%
a) 2 L
-
40%
b) 4 L
-
0%
c) 5 L
-
40%
d) 1 L
Q.18.
At 0°C and one atm. pressure, a gas occupies 100cc. If the pressure is increased to one and half-time and temperature is increased by one-third of absolute temperature, then final volume of the gas will be ...[ DEC 2000]
-
0%
a) 80 cc
-
17%
b) 88.9 cc
-
33%
c) 66.7 cc
-
50%
d) 100 cc
Explanation
Q.19.
A gas of volume 100 cc. is kept in vessel at pressure 104 Pa maintained at temperature 24°C. If now the pressure is increased to 105 Pa, keeping the temperature constant, then the volume of the gas becomes .. [ AFMC 1992]
-
17%
a) 10 cc.
-
17%
b) 100 cc.
-
33%
c) 1 cc.
-
33%
d) 1000 cc.
Q.20.
Positive deviation from ideal behaviour takes place because of ... [ IIT 2003]
-
67%
a) molecular interaction between atoms and PV/nRT > 1
-
0%
b) molecular interaction between atoms and PV/nRT < 1
-
17%
c) finite size of the atoms and PV/nRT > 1
-
17%
d) finite size of the atoms and PV/nRT < 1
Q.21.
At N.T.P. the volume of a gas is found to be 273 mL. what will be the volume of this gas at 600 mm Hg and 273°C? ... [ CPMT 1992]
-
20%
a) 391.8 mL
-
20%
b) 380 mL
-
40%
c) 691.6 mL
-
20%
d) 750 mL
Explanation
Q.22.
The temperature at which RMS velocity of SO2 molecules is half that of He molecules at 300K is ..[ NTSE 1991]
-
20%
a) 150 K
-
60%
b) 600 K
-
20%
c) 900 K
-
0%
d) 1200 K
Explanation
Q.23.
Which of the following statement is not true? [ Orissa JEE 2003]
-
33%
a) the pressure of a gas is due to collision of the gas molecules with the walls of the container
-
0%
b) the molecular velocity of any gas is proportional to the square toot of the absolute temperature
-
33%
c) the rate of diffusion of a gas is directly proportional to the density of the gas at constant pressure
-
33%
d) kinetic energy of an ideal gas is directly proportional to the absolute temperature
Q.24.
The volume of 1g each of methane ( CH4) ethane (C2H6), propane (C3H10) was measured at 350K and 1atm. What is the volume of butane? [ NCERT 1981]
-
20%
a) 495 cm3
-
0%
b) 600 cm3
-
0%
c) 900 cm3
-
80%
d) 1700 cm3
Explanation
Q.25.
Pressure of a mixture of 4g of O2 and 2g of H2 confined in a bulb of 1 litre at 0°C is ... [ AIIMS 2000]
-
60%
a) 25.215 atm
-
0%
b) 31.205 atm
-
20%
c) 45.215 atm
-
20%
d) 15.210 atm
Q.26.
A sample of gas occupies 100 ml at 27°C and 740 mm pressure. When its volume is changed to 80ml at 740 mm pressure, the temperature of the gas will be ..[ Vellore CMC 1991]
-
40%
a) 21.6 °C
-
20%
b) 240°C
-
40%
c) -33°C
-
0%
d) 89.5°C
Explanation
Q.27.
A sample of a given mass of gas at a constant temperature occupies 95 cm3 under a pressure of 9.962 ×104 N/mAt the same temperature, its volume at a pressure of 10.13 ×104 N/m2 is .... [ Bihar CEE 1992]
-
40%
a) 190 cm3
-
0%
b) 93 cm3
-
20%
c) 46.5 cm3
-
40%
d) 47.5 cm3
Q.28.
The density of a gas A is three times that of a gas B. If the molecular mass A is M, the molecular mass B is ..[ CPMT 1987]
-
0%
a) 3 M
-
20%
b) (√3)M
-
20%
c) M/3
-
60%
d) M/√3
Q.29.
Pure hydrogen sulphide is stored in a tank of 100 litre capacity at 20°C and 2 atm pressure. The mass of the gas will be ..... [ CPMT 1989]
-
0%
a) 34 g
-
0%
b) 340 g
-
60%
c) 282.68 g
-
40%
d)28.24 g
Explanation
Q.30.
For an ideal gas, number of moles per litre in terms of its pressure P, gas constant R and temperature T is ... [ AIEEE 2002]
-
17%
a) PT/R
-
17%
b) PTR
-
50%
c) P/RT
-
17%
d) RT/P