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MDCAT Chemistry Online Test MCQs With Answers
Question # 1
Energy of atom in compound is
Choose an answer
Higher than individual atom
Lower than individual atom
equal to individual atom
Impossible to predict
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Question # 2
According to kinetic theory of gases there are
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Intermolecular attractions
Molecules which have considerable volume
No intermolecular forces of attraction
The velocity of molecules decreases for each collision.
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Question # 3
The diffusion of gasses at absolute zero will be:
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Slightly decrease
unchanged
Slightly increased
Zero
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Question # 4
The unit of pressure ______ is commonly used by meteorologists
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mm of Hg
Kilopascal
Millibar
Pound per square inch
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Question # 5
The specifie substance (metabolite) that fits on the enzyme surface and is converted to products is called
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Co-factor
Isoenzyme
Prosthetic group
Substrate
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Question # 6
Steam causes more seers burns than boiling water. It is due to
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Latent heat of fusion
Latent heat of vaporization
Latent heat of sublimation
All of above
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Question # 7
The structure of sodium chloride is
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simple cube
body centered cubic
face centered cubic
depends upon conditions
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Question # 8
Among solids,the highet melting point is exhibited by
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Covalent solids
Ionic solids
Pseudo solids
Molecular solids
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Question # 9
A reaction A- B is independent of concentration of reactant A. The order of reaction will be
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First order
Second order
Third order
Zero order
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Question # 10
Oxygen and sulphur are present in VI-A group of the periodic table The hydride of oxygen i.e., H2O is liquid at room temperature but the hydride of sulphur (H2S) is a gas. This is due to
Choose an answer
greater bond angle of water than Hs
greater bond lengths in HS than H2O
hydrogen bonding in water
acidic character of HS
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Question # 11
How many grams of NaOH are present in 250 cm3 of its 0.2M solution
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,4 g
, 0.4 g
, 10 g
, 2 g
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Question # 12
A covalent bond may be
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100% covalent
Partial ionic
100% ionic
Both a and b
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Question # 13
Among the following molecules, which one has coordinate covalent (dative) bond?
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CCI4
CO2
CO
CH4
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Question # 14
The units of ionic product of H2O is
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Mole dm-3
Mole2 dm-6
Mole-1 dm-3
Mole-2 dm-6
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Question # 15
The Kw. of water at 25 C° is given by
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10(-7)
10(-10)
10(-12)
10(-14)
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Question # 16
Amorphous means
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arranged
ordered
shaped
shapeles (no arrangements)
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Question # 17
Plasma was introduced by
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Crookes
Soddy
Faraday
Van der Waal
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Question # 18
In elimination reaction i.e, in the formation of alkene, the reactivity of alkyl halide is in the order:
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CI>Br>I
I>Br>Cl
Br>CI>I
I>CI> Br
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Question # 19
When liquid solute is dissolved in liquid solvent, then the best unit of concentration is?
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% W/W
% W/V
% V/V
%V/W
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Question # 20
The slope of the graph is steepest at the beginning of reaction showing
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Rapid decrease in concentration of reactants
Rapid increase in concentration of reactants
Fast rate of reaction
All of the above
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Question # 21
Helical structure of proteins is stabilized by
Choose an answer
Peptide bond
Dipeptide bond
Van der Wall's forces
Hydrogen bonding
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Question # 22
Crystal lattice of the substances can be categorized into
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five types
seven types
six types
none of these
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Question # 23
If R, T, M, V and P are gas constant, temperature, molar mass, volume and pressure then density is given by:
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M/V
RT/M
PM/RT
V/M
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Question # 24
According to Hess's law, the enthalpy change for a reaction
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Depends on path
Independent of the path
The sum of ∆E and ∆H
None of these
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Question # 25
The kinetic theory of gases predicts that total kinetic energy of a gaseous assembly depends on
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Pressure of the gas
Temperature of the gas
Volume of the gas
Pressure,temperature,and volume of the gas.
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Question # 26
The reaction which is responsible for the production of electricity in the voltaic cell is
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Hydrolysis
Oxidation
Reduction
Redox
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Question # 27
The crystal system which has all cell angles equal, but not 90
°
and less than 120
° , the system is
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orthorhombic
monoclinic
hexagonal
rhombohedral
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Question # 28
Which of the following liquids have low vapour pressure at 25°C
Choose an answer
Water
Ethyl alcohol
Acetone
Diethyl ether
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Question # 29
The temperature below which a gas does not exist is called its
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Inversion temperature
Critical temperature
Neutral temperature
Curie point
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Question # 30
Which of the following are not known to form compounds in more than one oxidation state?
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Transition metals
Halogens
Alkali metals
Noble gases
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Question # 31
Saturated hydrocarbons having carbon atoms more than 20 in a molecule are solids due to
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higher densities
higher molar masses
the chain, are more zig-zag
all are correct
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Question # 32
When 1-butene reacts with bromine, the product formed will be
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1, 3-dihydroxy butane
But-1, 2-diol
1, 3-dihydroxy butan-diol
1,2-dibromo butane
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Question # 33
The volume of a gas that is occupied by its one mole at STP is called
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total volume
normal volume
molar volume
atomic volume
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Question # 34
chemist was able to measure the value of lattice energy of KCI to be 690 kj/mol.
From this experiment , he concluded that:
Choose an answer
lattice energy of KBr is 665 kj/mol and that of Ki is 630 kj/mol
lattice energy of KBr is 765 kj/mol and that of Kl 730 kj/mol
lattice energy of KBr is 730 kj/mol and that of Ki 765 kj/mol
lattice energy of KBr is 630 kj/mol and that of kL 665 KJ/mol
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Question # 35
NH
3
can form only one hydrogen bond per molecule though it has three partially positively charged hydrogens
Choose an answer
nitrogen in NH
3
has only one ions pair of electrons which can make one H-bond
ammonia is a base
ammonia is a weak acid
it ionizes to give one H
+
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Question # 36
According to the kinetic theory of gases,in an ideal gas,between two successive collisions a gas molecule travels
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Ina circular path
In a wavy path
In a straight line path
With an accelerated velocity
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Question # 37
Which of following factor affect vapour pressure of a liquid?
Choose an answer
temperature
inter molecules forces
size of the molecules
all of these
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Question # 38
The amount of heat required to convert one mole of solid into liquid is called
Choose an answer
molar heat of fusion
heat of fusion
heat of vaporization
heat of liquefaction
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Question # 39
The boiling point of H2O is 100°C while that of C2H5-OH is 78.5C°. The reason is that:
Choose an answer
H2O molecules are small-sized
the bond angles at oxygen atom are different
C2H5-group is electron donating
the number of H-bonds are greater in H20, than C2H5-OH
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Question # 40
The value of critical temperature of a gas depends upon its:
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Size
Intermolecular forces in it
Shape
All of above
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Question # 41
Benzene has pi electron
Choose an answer
2
4
6
8
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Question # 42
Van der Waal's forces exist in
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Polar compounds
Non-polar
Covalent
All types of atoms and molecules
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Question # 43
The root mean square velocity of a gas is doubled when the temperature is
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reduced to half.
reduced to one-fourth
increased four times
inereased two times
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Question # 44
Which of the following liquid has high vapour pressure?
Choose an answer
H
2
O
ether
CH
3
OH
C
2
H
5
OH
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Question # 45
To cook the food at a high mountain is difficult as compared to at sea level. The reason is that:
Choose an answer
the temperature at the top of the mountain is low
the density of water decreases at the mountains
the boiling point of water decreases at the mountain
the hydrogen bonding in water changes with the change of height
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Question # 46
Which of the following alcohol cannot be produced by treatment of aldehydes or ketones with NaBH4
Choose an answer
I-propanol
2-Methyl-2-propanol
2-propanol
Ethanol
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Question # 47
Which is not true in case of an ideal gas?
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It cannot be converted into a liquid
There is no interaction between the molecules
All molecules of the gas move with same speed
At a given temperature P'V is proportional to the amount of the gas
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Question # 48
As gases can adopt the shape of the container so they have
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no fixed shapes
fixed shapes
different shapes
definite shapes
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Question # 49
Which set of elements is good loser of electrons
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F2. Cl2, Br2
N, P. As
O. S, Se
Li, Na, K
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Question # 50
The B.P of H2O at Murree Hills is
Choose an answer
99.8C
98°C
100C°
89°C
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Question # 51
R = 0.08205:
Choose an answer
atm dm
3
mol
-1
k
-1
J mole
-1
k
-1
Nm mol
-1
k
-1
cal. mol
-1
k
-1
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Question # 52
During oxidation process, oxidation number of an element
Choose an answer
Decreases
Increases
Remains constant
Both a and b
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Question # 53
The density of neon will be highest at
Choose an answer
STP
0°C, 2 atm
273°C, 1 atm
273°C, 2 atm
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Question # 54
A real gas most closely approaches the behaviour of an ideal gas at
Choose an answer
15 atm. and 200 K
1 atm. and 273 K
0.5 atm.and 500 K
15 tm, and 500 K
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Question # 55
Coinage metals Cu, Ag and Au are the least reactive because they have
Choose an answer
Negative reduction potential
Negative oxidation potential
Positive reduction potential
Positive oxidation potential
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Question # 56
The kinetic energy of 4 moles of nitrogen gas at 127°C is? cals.(R = 2 cal mol
-1
K
-1
)
Choose an answer
4400
3200
4800
1524
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Question # 57
Bonding in MgO is an example of
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lonic bond
Polar bond
Covalent bond
Coordination covalent bond
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Question # 58
The height of the peak in the mass spectrum shows
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Number of isotopes
Relative abundance
Mass number
Number of protons
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Question # 59
The rate diffusion of H
2
is 4 times than the of an unknown gas at same temperature and pressure, the molecular mass of unknown gas is
Choose an answer
32
16
4
64
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Question # 60
Which of the following is not a property of enzymes?
Choose an answer
extraordinary speciffcity
reversibility of reactions
high efficiency
minimum activity at optimum T
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Question # 61
choose the temperature among the following at which real gas obeys ideal gas laws when pressure range is appreciable:
Choose an answer
critical temperature
boyle's temperature
inversion temperature
transition temperature
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