Top of Pyramid - Test #47 - States of Matter
Contact Number: 9667591930 / 8527521718
1.
-1 mol-1
Which is lighter than dry air?
(c) 0.082 L atm-1 K mol-1
(a) Moist air (b) SO2
(d) 0.082 L-1 atm-1 K mol
(c) Cl2 (d) O2
8.
2.
The number of molecules present in 1 mL of gas or
Joule-Thomson coefficient ( ∂ T / ∂ P)H for an ideal gas is: vapour at STP is:
(a) zero (b) +ve (a) called Loschmidt's number
(c) -ve (d) none of these (b) equal to 2.617 x 1019 per mL
3. (c) both (a) and (b)
The unit of van der Waals' constant 'b' is : (d) none of the above
(a) cm3 mol-1 9.
(b) litre mol-1 600 cc of a gas at a pressure of 750 mm is compressed to
500 cc. Taking the temperature to remain constant, the
(c) m3 mol-1 increase in pressure is
(d) all of these (a) 150 mm (b) 250 mm
4. (c) 350 mm (d) 450 mm
The beans are cooked earlier in pressure cooker, because 10.
An ideal gas expands according to PV=constant. On
(a) boiling point increases with increasing pressure expansion, the temperature of gas:
(b) boiling point decreases with increasing pressure (a) will rise
(c) extra pressure of pressure cooker softens the beans (b) will drop
(d) internal energy is not lost while cooking in pressure (c) will remain constant
cooker
(d) cannot be determined because the external pressure is
5. not known
The compressibility factor for H2 and He is usually: 11.
(a) >1 (b) =1 Select the correct statement. In the gas equation PV =
nRT
(c) <1 (d) either of these
(a) n is the number of molecules of a gas
6.
(b) V denotes the volume of 1 mole of the gas
Boyle's law is applicable in :
(c) n moles of the gas have a volume V
(a) isobaric process
(d) p is the pressure of the gas when only one mole of the
(b) isochoric process gas is present
(c) isothermal process 12.
(d) adiabatic process The ratio among most probable velocity, mean velocity
and root mean square velocity is given by
7.
The correct value of the gas constant 'R' is close to (a) 1:2:3 (b) 1: √2 : √3
(a) 0.082 L atm K (c) √2 : √3 :
(b) 0.082 L atm K
Page: 1
Top of Pyramid - Test #47 - States of Matter
Contact Number: 9667591930 / 8527521718
8 8 2. 273 K and 2 atm
√ π
(d) √2 :
√ π
: √3
3. 546 K and 1 atm
4. 546 K and 2 atm
13.
19.
The compressibility of a gas is less than unity at STP.
Therefore: 20 L of SO2 diffuses through a porous partition in 60s.
(a) Vm > 22.4 litre (b) Vm < 22.4 litre Volume of O2 diffuse under similar condition in 30s will
be:-
(c) Vm = 22.4 litre (d) Vm = 44.8 litre
1. 12.14 L
14.
2. 14.14 L
The numberical value of cp -cv is equal to:
3. 18.14 L
(a) R (b) R/M 4. 28.14 L
(c) M/R (d) none of these 20.
15. A gas diffuses four time quickly as oxygen. The
In which case rate of diffusion is highest if all are present molecular weight of gas is:
in the same container at the same temerature: 1. 2
1. 4g H2 2. 4
2. 32g O2 3. 8
3. 22g CO2 4. 16
4. 56g N2 21.
If density of vapours of a substance of molar mass 18 gm
16.
/ mole at 1 atm pressure and 500 K is 0.36 kg m–3 , then
Partial pressure of Hydrogen in Flask containing 2 gm of value of Z for the vapours is : (Take R = 0.082 L atm
H2 and 32 gm of SO2 is mole K–1)
1. 1/16 of total pressure 41
(1) 50
2. 1/2 of total pressure
50
3. 2/3 of total pressure (2) 41
4. 1/8 of total pressure (3) 1.1
17. (4) 0.9
At high pressure, the compressibility factor 'Z' is equal 22.
to
A sample of water gas has a composition by volume of
1. unity 50% H2, 45% CO and 5% CO2. Calculate the volume in
2. 1-Pb/RT litre at S.T.P. of water gas which on treatment with excess
of stream will produce 5 litre H2. The equation for the
3. 1+Pb/RT
4. zero reaction is : CO + H2O → CO2+ H2
18. (1) 4.263 Litre
The density of O2(g) is maximum at:- (2) 5.263 Litre
1. STP (3) 6.263 Litre
Page: 2
Top of Pyramid - Test #47 - States of Matter
Contact Number: 9667591930 / 8527521718
(4) 7.263 Litre (3) 4 atm
23. (4) 1 atm
A 2 m long tube closed at one end is lowered vertically 27.
into' water until the closed end is flush with the water
surface. See figure below. Calculate the water level 3.2 g of oxygen (At. wt. = 16) and 0.2 g of hydrogen (At.
height in the tube. (Barometric pressure –1 atm =10 m of wt. = 1) are placed in a 1.12 litre flask at 0°C. The total
hydrostatic water head, Temperature = 25°C, Density of, pressure of the gas mixture will be [CBSE PMT 1992]
water = 1.00 g/ml. Neglect water vapour pressure). (1) 1 atm
(2) 4 atm
(3) 3 atm
(4) 2 atm
28.
Equal weights of methane and oxygen are mixed in an
(1) 1.01 m empty container at 25°C. The fraction of the total
pressure exerted by oxygen is [IIT 1981]
(2) 0.29 m
(1) 1/3
(3) 1.71–m
(2) 1/2
(4) 0.92 m
(3) 2/3
24.
(4) 1 / 3 × 273 / 298
A gas occupied a volume of 250 ml at 700 mm Hg
pressure and 25°C. What additional pressure is required 29.
to reduce the gas volume to its 4/5th value at the same The rate of diffusion of methane at a given temperature is
temperature twice that of gas X. The molecular weight of X is [IIT
1990]
(1) 225 mm Hg
(1) 64.0
(2) 175 mm Hg
(2) 32.0
(3) 150 mm Hg
(3) 4.0
(4) 265 mm Hg
(4) 8.0
25.
30.
A sealed tube which can withstand a pressure of 3
atmosphere is filled with air at 27 oC and 760 mm The kinetic energy for 14 grams of nitrogen gas at 127°C
pressure. The temperature above which the tube will is nearly (mol. mass of nitrogen = 28 and gas constant =
burst will be 8.31JK–1mol–1) [CBSE PMT 1999]
(1) 900°C (1) 1.0 J
(2) 627°C (2) 4.15 J
(3) 726°C (3) 2493 J
(4) 1173°C (4) 3.3 J
26. 31.
The pressure of 2 moles of an ideal gas at 546 K having If the average velocity of N2 molecules is 0.3 m/s at
volume 44.8 L is [CPMT 1995] 27°C, then the velocity of 0.6 m/s will take place at
(1) 2 atm [Manipal PMT 2001]
(2) 3 atm (1) 273 K
Page: 3
Top of Pyramid - Test #47 - States of Matter
Contact Number: 9667591930 / 8527521718
(2) 927 K Which of the following curves does not represent Boyle's
Law
(3) 1000 K
(4) 1200 K
32.
A gas such as carbon monoxide would be most likely to (A) (B)
obey the ideal gas law at
(a) high temperatures and low pressures
(b) low temperatures and high pressures
(C) (D)
(c) high temperatures and high pressures
37.
(d) low temperatures and low pressures
The ratio of average molecular kinetic energy of UF 6 to
33.
that of H 2, both at 300 K is -
A gaseous mixture was prepared by taking equal moles
of CO and N2. If the total pressure of the mixture was (A) 1 : 1
found 1 atmosphere, the partial pressure of the nitrogen (B) 7 : 2
(N2) in the mixture is
(C) 176 : 1
(a) 0.8 atm
(D) 2 : 7
(b) 0.9 aim
38.
(c) 1 atm
X ml of H 2 gas effuses through a hole in a container in 5
(d) 0.5 atm seconds. The time taken for the effusion of the same
34. volume of the gas specified below under ideal condition
is
What volume of oxygen gas (O2) measured at 0°C and 1
(A) 10 seconds : He
atm, is needed to burn completely 1 L of propane gas
(C3H8) measured under the same conditions? (B) 20 seconds : O 2
(a) 7L (C) 25 seconds : CO
(b) 6L (D) 55 seconds : CO 2
(c) 5L 39.
(d) 10L The valves X and Y are opened simultaneously. The
35. white fumes of NH 4Cl will first form at :
A certain volume of argon gas (Mol. wt. = 40) requires
45 s to effuse through a hole at a certain pressure and
temperature. The same volume of another gas of
unknown molecular weight requires 60s to pass through
the same hole under the same conditions of temperature
and pressure. The molecular weight of the gas is
(A) 53 (A) A
(B) 35 (B) B
(C) 71 (C) C
(D) 120 (D) A, B and C simultaneously
36. 40.
Page: 4
Top of Pyramid - Test #47 - States of Matter
Contact Number: 9667591930 / 8527521718
A gas mixture consists of 2 moles of oxygen and 4 moles b(L mol-
of a argon at temperature T. Neglecting all vibrational Gas a (atm L2 mol-2) 1)
modes, the total internal energy of the system is –
(A) 4RT
W 4.0 0.027
(B) 5RT
(C) 15RT X 8.0 0.030
(D) 11RT
Y 6.0 0.032
41.
Two flasks of equal volume connected by a narrow tube Z 12.0 0.027
(of negligible volume) at 27ºC and contain 0.70 mole of
H 2 at 0.5 atm. One of the flasks is then immersed into a Which one of these gases has the highest critical
hot bath, kept at 127ºC, while the other remains at 27ºC. temperature?
Calculate the final pressure.
1. W
(A) 5.714 atm
2. X
(B) 0.5714 atm
3. Y
(C) 2.5214 atm
4. Z
(D) 5.5114 atm
45.
42. TC
Which is not correct curve for gay-lusacc's law? The excluded volume of a gas will be larger, if P is:
C
1. small
2. large
3. equal to 1
1. 2.
4. less than unity
Fill OMR Sheet
3. 4.
43.
In two vessels of 1 litre each at the same temperature 1 g
of H 2 and 1 g of CH 4 are taken, for these:
1. V rms values will be same
2. Kinetic energy per mol will be same
3. Total kinetic energy will be same
4. Pressure will be same
44.
The van der Waals parameters for gases W, X, Y and Z
are
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Top of Pyramid - Test #47 - States of Matter
Contact Number: 9667591930 / 8527521718
Page: 6
