Uncategories Entry Test Preparation 2015, Chemistry BOOK 1 Chapter # 2 Gasess MCQS with Answer keys

Entry Test Preparation 2015, Chemistry BOOK 1 Chapter # 2 Gasess MCQS with Answer keys

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Entry Test Preparation 2015 
Chemistry
BOOK 1
Chapter # 2
Gasess
Direction

You are given following questions from the topic, with four choices A through D. Select the choice that will 
answer the question best.

1.         The number of atoms in 0.004 g of magnesium is close to
            A.        24                                            B.        2 x 1020
            C.        1020                                          D.        6.02 x 1023
2.         Wt. of 112 ml of oxygen at NTP on liquification would be
            A.        0.32 g                                      B.        0.64 g
            C.        0.16 g                                      D.        0.96 g
3.         The vapour density of a gas is 11.2. The volume occupied by 11.2 g of this gas at
N.T.P. is
            A.        22.4 litres                                B.        1 litres
            C.        11.2 litre                                              D.        2.24 litres
4.         In the equation PV = nRT which one cannot be numerically equal to R
            A.        8.31 x 107 erg3 K-1 mol-1          B.        8.31 x 107 dynes Cm K-1 mol-1
            C.        8.31 JK-1 mol-1             D.        8.31 L atm k-1 mol-1
5.         A real gas most closely approaches the behaviour of an ideal gas at
            A.        15 atm. And 200 K                 B.        1 atm. And 273 K
            C.        0.5 atm. And 500 K                D.        15 atm. And 500 K
6.         The correct value of the gas constant R is close to
            A.        0.082 litre-atm K-1 mol-1          B.        0.082 litre-atm-1K mol
            C.        0.082 litre-atm K                     D.        0.082 litre-atm-1 K mol-1
7.         3.2 g of oxygen (At. Wt. = 16) and 0.2 g of hydrogen (At. Wt. = 1) are placed in a
1.12 L flask at 0oC. The total pressure of the gas mixture will be
            A.        1 atm                                       B.        8 atm
            C.        3 atm                                       D.        2 atm
8.         If rate of diffusion of A is 5 times that of B, what will be the density ratio of A
and B?
            A.        1/25                                         B.        1/5
            C.        25                                            D.        5
9.         Two separate bulbs contain ideal gases A and B. The density of A is twice as that
of gas B. The molecular mass of gas A is half as that of B. If two gases are at
same temperature, the ratio of the pressure of A to that of B is
            A.        2                                              B.        1/2
            C.        4                                              D.        1/4
10.       Critical temperature of O2 is
            A.        132 K                                      B.        118 K
            C.        478 K                                      D.        154 K
11.       The compressibility factor of an ideal gas is
            A.        0                                              B.        1
            C.        2                                              D.        4
12.       Two moles of an ideal gas at 1 atm are compressed to 2 atm at 273 K. The
enthalpy change for the process is
            A.        2 litre atm                                B.        1 litre atm
            C.        zero                                         D.        3 litre atm
13.       In a flask of volume V litres, 0.2 mole of oxygen, 0.4 mole of nitrogen, 0.1 mole
of NH3 and 0.3 mole of He are enclosed at 27oC. If the total pressure exerted by
these non reacting gases is one atmosphere, the partial pressure exerted by nitrogen is
            A.        0.1 atm                                                B.        0.4 atm
            C.        0.3 atm                                                D.        0.2 atm

14.       The rate of diffusion of a gas is proportional to
            A.                                                        B.                   
            C.        P / d                                         D.       



15.       A and B are ideal gases. The molecular weights of A and B are in the ratio of 1:4.
The pressure of a gas mixture containing equal weights of A and B is P atm. What
is the partial pressure ( in atm.) of B in the mixture
            A.        P / 5                                         B.        P / 2
            C.        P / 2.5                                      D.        3P / 4
16.       If allowed to expand the gases suddenly
            A.        heat up                                                B.        move randomly
            C.        react                                        D.        cool down
17.       According to Charies Law
            A.         is constant                         B.         is constant
            C.         is constant                                   D.        PV is constant
18.       One Pascal is equal to
            A.        1 Nm-2                                     B.        1Nm
            C.        1 Nm-1                                     D.        1 Nm2
19.       Absolute zero, the lowest temperature on Kelvin scale lies at
            A.        -273oC                                     B.        273o
            C.        -100oC                                     D.        100oC
20.       At same temperature and pressure equal volumes of O2 and H2 gases will diffuse in the ratio
            A.        1 : 16                                       B.        1 : 8
            C.        1 : 4                                         D.        1 :
21.       Distribution of energies among molecules was studied by
            A.        Charles                                    B.        Boltzmann
            C.        Clausius                                   D.        Maxwell
22.       Which pair of the gases doesn’t obey Dalton’s Law of partial pressures.
            A.        H2 and O2                                B.        N2 and O2
            C.        H2S and H2                             D.        NH3 and HCl
23.       The general equation to know the volumes of a given mass of a gas at various temperatures is
            A.        PV = nRT                                B.       
            C.                                          D.       
24.       The rate of diffusion of H2 is 4 times than that of an unknown gas at same temperature and pressure, the molecular mass of unknown gas is
            A.        32                                            B.        16
            C.        4                                              D.        64
25.       Which is the unit of a
            A.        atm mol                                   B.        K-1mol-1Nm
            C.        atm-1K-2mol-6                           D.        Nm+4mol-2
26.       What is the numerical value of ‘R’ (the gas constant) in S.l. units?
            A.        83143 J/mole/K                       B.        Avogardro’s law
            C.        83.143 J/mole/K                      D.        8.3143 J/mole/K
27.       What is the mass of 1020 molecules of CO2 at STP?
            A.        7.3  10-3 g                             B.        7.9  10-3 g    
            C.        3.2  10-3 g                             D.        4.9  10-3 g    
28.       The ideal gas law holds best under the conditions of
            A.        high pressure and high temperature
            B.        low pressure and high temperature
            C.        low pressure and low temperature
            D.        high pressure and low temperature


29.       Deep sea divers breath air under increased pressure, therefore they use a mixture of
            A.        96% N2 and 4% O2
            B.        96% O2 and 4% N2
            C.        94% N2 and 6% O2
D.        94% O2 and 6% N2
30.       The decreasing order of the rate of diffusion of gases NH3, SO2, Cl2 and CO2 is
            A.        NH3 > SO2 > Cl2 > CO2
            B.        NH3 > CO2 > SO2 > Cl2
            C.        Cl2 > SO2 > CO2 > NH3
            D.        Cl2 > NH3 > SO2 > CO2
31.       Joule is a unit of energy which is defied as
            A.        Kgm2s-2                                   B.        Kgm2s-1
            C.        Kgms-2                                     D.        Kgm2s-2
32.       The phenomenon in which sudden expansion of a gas causes cooling is called
            A.        evaporation                             B.        cooling
            C.        Joule Thomson effect              D.        sublimation
33.       Real gases deviates from the ideal behaviour at very
            A.        high pressure                           B.        low temperature
            C.        low pressure                            D.        both (a) and (b)
34.       Whish one of the following gases is ideal at – 200oC?
            A.        N2                                            B.        He
            C.        both                                         D.        none
35.       Plasma is known as the
            A.        first state of matter                 B.        second state of matter
            C.        third                                        D.        fourth
36.       The law which describe the relationship between the volume and temperature of a gas at constant pressure is called
            A.        Boyle’s law                             B.        Avogadro’s law
            C.        Charle’s law                            D.        Graham’s law
37.       A gas occupies a volume of 2 litres at 27oC and 1 atmospheric pressure. The expression for its volume at STP is
            A.                                           B.       
            C.                                   D.       
38.       Which of the following indicate the value of ‘R’ in Joules K-1 mol-1?
            A.        0.0821                                     B.        8.314
            C.        1.987                                       D.        8.21  107
39.       A litre of a gas at STP weights 1.25 grams. Molecular weights of the gas is
            A.        28                                            B.        22.4
            C.        11.2                                         D.        12.5
40.       A gas having a volume of 20 dm3 at 0oC and pressure is 2.0 atm. What will be the volume of gas when gas is allowed to expand if the temperature is maintained at 273K and pressure is changed to 1.5 atm
            A.        26.6dm3                                   B.        20 dm3
            C.        10 dm3                                     D.        11.4          dm
41.       If a gas is allowed to expand at constant temperature to 4 times its original volume. The pressure will
            A.        increase 4 times                       B.        decreases to one fourth
            C.        become half                             D.        remains constant
42.       At what temperature a gas kept at 0oC and at constant pressure will be double its volume?
            A.        0oC                                          B.        273oC
            C.        273K                                       D.        546oC
43.       Two litres of gas are maintained at 25oC and 2 atmospheric pressure. If the pressure is doubled and the absolute temperature is halved the gas will occupy
            A.        2 litre                                       B.        4.0 litre
            C.        0.5 litre                                    D.        1 litre



44.       The temperature at which Oxygen will have the same velocity as that of methane at 0oC is
            A.        0oC                                          B.        273oC
            C.        546oC                                      D.        273K

45.       The square root of the mean of the squares of the velocities possessed by different fractions of molecules at a particular temperature is termed as
            A.        Instrinsic velocity                    B.        Root mean square velocity
            C.        Average velocity                     D.        All of these
46.       Vander waal’s equation for real gases is
            A.           B.       
            C.               D.       


47.       The Vander wall’s constant ‘b’ of  a gas is four time then the
            A.        pressure of the gas                  B.        volume of a gas
            C.        molar volume of that gas                    D.        temperature of a gas
48.       Which is one of the wrong postulate of KMT
            A.        No force of attraction present between gas molecule
B.        K.E is proportional to Temperature
            C.        Collision among gas molecules is elastic
            D.        None of these
49.       Which of the following gas at ordinary temperature and pressure behave as an ideal gas
            A.        N2                                            B.        H2
            C.        CO                                          D.        All of these
50.       Water vapour do not behave ideally at a temperature of
            A.        100oC                                      B.        273oC 
            C.        -273.15oC                                D.        0oC      



Chapter # 2
ANSWERS
(GASES)


1
C
2
C
3
B
4
D
5
C
6
A
7
B
8
A
9
C
10
D
11
B
12
C
13
B
14
B
15
A
16
D
17
B
18
A
19
A
20
C
21
B
22
D
23
B
24
A
25
D
26
D
27
A
28
B
29
A
30
B
31
D
32
C
33
D
34
D
35
D
36
C
37
D
38
B
39
A
40
A
41
B
42
B
43
C
44
B
45
B
46
B
47
C
48
A
49
D
50
C




Best Regards :

Zohaib Hassan
Trainee Geological Engineer
GRC Private Limited
Karora Hydropower Project Besham KPK,Pakistan
Cell#+923318601240
Email:Zohaibhani@gmail.com






















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