Chemistry Solved MCQs For MCAT
From Chapter Two Gases
Q. 1. Professor Qawwi told his students that air is a
mixture because: suddenly a student raised his hand and said
a.
it
is colourless
(c)
Q. 2. Imagine Dr. Khan is sitting in a room. The room
is closed from all sides, no entry, no exit of any gas. If the room expands
suddenly then
a.
he
will be frightened
(c)
Q. 3. which of the following elements will have
strongest Van Der Waal force of attraction between its molecules
a.
hydrogen
(c)
Q. 4. The beaker shown in the figure contains slurry
of ice and water, the three thermometers Fahrenheit, Kelvin and Centigrade
placed in it. The thermometers are represented by A, B and C respectively. The
lowest reading will be on thermometer.
a.
A
(c)
Q. 5. Which thermometer will have its reading 273
degrees greater than that of thermometer C?
a.
A
(b)
Q. 6. The temperature recorded by Kelvin scale is
a.
0K
(b)
Q. 7. If three birds called O2, CI2
and H2 were flying in the garden of Islamia College Peshawar then,
I.
Fastest
birds are O2 and CI2
a.
I
only
(b)
Q. 8. One liter of an unknown gas weighs 1.25 grams
at S.T.P, one possible formula for the gas is
(b)
Q. 9. If pressure on a gas is increased from 2 atm to
4 atm than its volume will decrease from
a.
6L
to 4L
(d)
Q. 10. An unknown gas has a density of 2.45
g/L at 1.5 atmospheric pressure and 25 oC. The gas is
a.
Kr
(d)
Q. 11. This is a known fact that the molar volumes of different
gases at S.T.P are
a.
little
bit greater than the molar volumes of liquids
(d)
Q. 12. The behavior of a gas is non-ideal at
a.
lo2w
temperature and low pressure
(d)
Q. 13. Ammonium Perchlorate is used as solid
fuel in rockets. During the process it decomposes according to the reaction
given below
4NH4CIO4(g) 2CI2(g) +8H2O(g) +2N2O(g) +3O2(g)
The total
volume of all the gases produced at S.T.P by the decomposition of 8 moles of
Ammonium Perchlorate will be
a.
30
L
(b)
Q. 14. Compressed natural gas (CNG) contains
mainly methane CH4. Methane gas burns in air according to the
following reaction.
CH4(g)
+ 2O2(g) CO2(g)
+ 2H2O(g)
a.
0.5
L
(d)
Q. 15. A kid has a helium filled balloon which
deflates at the rate of 1.00 liter/day by He gas leaking through the relatively
porous skin of the balloon. How fast would carbon dioxide (CO2) leak
from a balloon made of the same material?
a.
3.0
L/day
(b)
Q. 16. All of the following statements are false except
a.
gas
molecules do not attract each other at very low temperature
(d)
Q. 17. At the same temperature and pressure
helium is more ideal than hydrogen due to
a.
greater
molar mass
(d)
Q. 18. A container with a porous wall has a
mixture of H2, He, N2 and O2. Which of these
gases will take maximum time in getting out of the container?
a.
H2
(d)
for an unknown gas is
equal to
a.
0.082
L.atm.mol-1.K
(b)
Q. 20. If the temperature of the atmosphere is
30oC then which of the following will have highest average speed
a.
O2
(b)
Q. 1. Professor Qawwi told his students that air is a
mixture because: suddenly a student raised his hand and said
a.
it
is colourless
b.
oxygen
can be removed from it
c.
its
composition is different at different altitudes
d.
it
has different properties from its constituents
(c)
Q. 2. Imagine Dr. Khan is sitting in a room. The room
is closed from all sides, no entry, no exit of any gas. If the room expands
suddenly then
a.
he
will be frightened
b.
his
blood pressure will decrease
c.
he
will feel cool
d.
he
will feel warmth
(c)
Q. 3. which of the following elements will have
strongest Van Der Waal force of attraction between its molecules
a.
hydrogen
b.
oxygen
c.
chlorine
d.
nitrogen
(c)
Q. 4. The beaker shown in the figure contains slurry
of ice and water, the three thermometers Fahrenheit, Kelvin and Centigrade
placed in it. The thermometers are represented by A, B and C respectively. The
lowest reading will be on thermometer.
a.
A
b.
B
c.
C
d.
Both
A and C
(c)
Q. 5. Which thermometer will have its reading 273
degrees greater than that of thermometer C?
a.
A
b.
B
c.
C
has greater reading than all other thermometer
d.
B
has 273 degrees greater reading than A
(b)
Q. 6. The temperature recorded by Kelvin scale is
a.
0K
b.
273K
c.
373K
d.
Absolute
scale is unable to record this temperature
(b)
Q. 7. If three birds called O2, CI2
and H2 were flying in the garden of Islamia College Peshawar then,
I.
Fastest
birds are O2 and CI2
II.
Slowest
bird is CI2
III.
Bird
called O2 is in the middle.
a.
I
only
b.
II
and III only
c.
I
and III only
d.
III
only
(b)
Q. 8. One liter of an unknown gas weighs 1.25 grams
at S.T.P, one possible formula for the gas is
a.
CO2
b.
CO
c.
O2
d.
SO2
(b)
Q. 9. If pressure on a gas is increased from 2 atm to
4 atm than its volume will decrease from
a.
6L
to 4L
b.
8L
to 2L
c.
3L
to 1L
d.
4L
to 2L
(d)
Q. 10. An unknown gas has a density of 2.45
g/L at 1.5 atmospheric pressure and 25 oC. The gas is
a.
Kr
b.
CI2
c.
SO2
d.
Ar
(d)
Q. 11. This is a known fact that the molar volumes of different
gases at S.T.P are
a.
little
bit greater than the molar volumes of liquids
b.
little
bit less than the molar volumes of solids
c.
about
the same as the molar volumes of liquids
d.
much
larger than the molar volumes of liquids and solids
(d)
Q. 12. The behavior of a gas is non-ideal at
a.
lo2w
temperature and low pressure
b.
high
temperature and high pressure
c.
high
temperature and low pressure
d.
low
temperature and high pressure
(d)
Q. 13. Ammonium Perchlorate is used as solid
fuel in rockets. During the process it decomposes according to the reaction
given below
4NH4CIO4(g) 2CI2(g) +8H2O(g) +2N2O(g) +3O2(g)
The total
volume of all the gases produced at S.T.P by the decomposition of 8 moles of
Ammonium Perchlorate will be
a.
30
L
b.
672
L
c.
179.0
L
d.
60
L
(b)
Q. 14. Compressed natural gas (CNG) contains
mainly methane CH4. Methane gas burns in air according to the
following reaction.
CH4(g)
+ 2O2(g) CO2(g)
+ 2H2O(g)
If 8 g of
methane is burnt, what volume of CO2 measured at S.T.P. will be
produced?
a.
0.5
L
b.
22
L
c.
22.4
L
d.
11.2
L
(d)
Q. 15. A kid has a helium filled balloon which
deflates at the rate of 1.00 liter/day by He gas leaking through the relatively
porous skin of the balloon. How fast would carbon dioxide (CO2) leak
from a balloon made of the same material?
a.
3.0
L/day
b.
0.3
L/day
c.
1.33
L/day
d.
3.33
L/day
(b)
Q. 16. All of the following statements are false except
a.
gas
molecules do not attract each other at very low temperature
b.
all
of the gases cannot be liquefied
c.
increase
in pressure will not decrease the intermolecular distance in a gas
d.
actual
volume of a gas is not negligible at very high pressure
(d)
Q. 17. At the same temperature and pressure
helium is more ideal than hydrogen due to
a.
greater
molar mass
b.
less
molar mass
c.
greater
molecular size
d.
less
molecular size
(d)
Q. 18. A container with a porous wall has a
mixture of H2, He, N2 and O2. Which of these
gases will take maximum time in getting out of the container?
a.
H2
b.
He
c.
N2
d.
O2
(d)
Q. 19. The value of for an unknown gas is
equal to
for an unknown gas is
equal to
a.
0.082
L.atm.mol-1.K
b.
0.082
L.atm.mol-1.K-1
c.
0.82
L.atm.mol.K-1
d.
0.82
L.atm.mol.K
(b)
Q. 20. If the temperature of the atmosphere is
30oC then which of the following will have highest average speed
a.
O2
b.
H2
c.
Ne
d.
N2
(b)
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