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MDCAT Chemistry Online Test MCQs With Answers
Question # 1
The nature of crystals formed due to London forces of interaction are
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molecular
metallic
ionic
covalent
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Question # 2
The value of the vapour pressure of water at its boiling point at Karachi and Murree is
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same
different
depends upon the environmental conditions in both cities
greater at Murree and less at Karachi
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Question # 3
The number of atoms or molecules whose concentrations determines the rate of a chemical reaction is called the
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Molecularity of the reaction
specific activity of the reaction
Order of the reaction
rate constant of the reaction
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Question # 4
The largest number of molecules are present in
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3.6 g of H2O
4.6 g of C2H5OH
2.8 g of CO
5.4 g of N2O5
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Question # 5
The pressure exerted by the vapours in equilibrium with its pure liquid at given temperature is called the
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equilibrium pressure
atmospheric pressure
vapour pressure
external pressure
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Question # 6
Relationship between volume of a gas and prevailing conditions of temperature and pressure are called
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Gas laws
Equilibrium laws
Rate laws
None of these
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Question # 7
The most unsymmetrical one in crystal system is
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triclinic
Li, Na, K
monoclinic
hexagonal
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Question # 8
C=O and C=C bonds are differentiated by
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Hybridization of C-atom
Bond angles
Ammonical AgNO3
Conc. HNO3
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Question # 9
Active sulphonating agent during sulphonation of benzene is
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SO2
SO3
SO3H
SO3+
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Question # 10
Which of the following statements about amorphous solids is incorrect?
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They melt over a range of temperature
They are anisotropic
There is no orderly arrangement of particles
They are rigid and icompressible
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Question # 11
lonic solids are characterized by which one of the following properties
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moderately low pressure
high vapour pressure
good conductivity in solid state
solubility in polar solvents
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Question # 12
How many isotopes are present in palladium
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Two
Four
Six
nine
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Question # 13
Formation of Picric acid from phenol needs heating, one possible reason for it is
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acidity of phenol
e- donating nature of-OH
acidity of picric acid
e- with drawing effect of- NO2
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Question # 14
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 # 15
A mixture of 1-chloropropane and 2-chloro-propane when treated with alcoholic KOH, gives
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Prop-2-ene
Isopropy lene
Propene
A mixture of prop-l-ene
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Question # 16
Sudden expansion of gas molecule cause cooling because
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Expansion release some amount of energy
During expansion new force of attraction are developed and energy is released
During expansion force of attraction between closest molecules break and energy is used
Kinetic energy of gas molecules increases
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Question # 17
What is the formula of cryolite?
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Al2O3.2H2O
Na2B4O7 .10 H2O
Na3AIF6
Ca2B6O11. 5H2O
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Question # 18
In which of the following compounds hydrogen bonding is not present
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water
ethanol
ether
ammonia
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Question # 19
Estyl butyrate has flavour like
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Banans
Jasmine
Pineapple
Orange
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Question # 20
The element which exhibits maximum catenation property is
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C
Pb
Ge
Sn
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Question # 21
AgNO
3
is a polymorphic having two different crystalline forms which are
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cubic, tetragonal
monoclinic, hexagonal
cubic, orthorhombic
orthorhombic, rhombohedral
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Question # 22
If temperature is 73K and volume is 146 cm3 then calculate the value of K=V/T
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5
4
3
2
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Question # 23
A doubly bonded carbon is
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cannot be sp2 hybridized
can be sp hybridized
can attach with three carbons
can attach with three hydrogens
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Question # 24
The most complex strueture a single polypetide can assume is
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1° structure
2°structure
3° structure
4° structure
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Question # 25
The electrochemical series is based on
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pH scale
Redox scale
Hdrogen scale
Arrhenius scale
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Question # 26
Which of the following elements is most metallic
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Bi
sb
As
P
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Question # 27
NaCI has face centered cubic structure. The Na ion at the face of the unit cell is shared by
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2-unit cells
4-units cells
only one unit cell
8-unit cells
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Question # 28
Increased concentration of enzyme alkaline phosphatase is a sign of
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hemophilia
heart disease
thrombosis
rickets
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Question # 29
Dehydrogenase is an erample of
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Transferase
Hydrolase
Lyase
Oxido-reductase
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Question # 30
The reaction of alkyl halide in the presence of alcoholic KOH is
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Substitution
Addition
Acid-base
Elimination
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Question # 31
Which element differs from rest of elements of its group?
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Ba
Mg
Ca
Be
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Question # 32
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 # 33
Which pair of following pair is metalloid?
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Antimony and bismuth
Phosphorous and arsenic
Nitrogen and phosphorous
Arsenic and antimony
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Question # 34
Considering the physical properties of the gases, which of the following statements about particles of gas is not true. The particles
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orderly arranged
randomly moving
having wide spaces
causing pressure
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Question # 35
Which of the following gases have lowest density at room temperature
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CO
N
2
Ne
NH
3
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Question # 36
Electrons in 5d energy level are filled up in case of
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Lanthanides
Transition metals
Actinides
Rare gases
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Question # 37
In graphite crystal, carbon is
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sp hybridized
sp
2
hybridized
sp
3
hybridized
None
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Question # 38
The scale of temperature that shows the freezing point of water at 0
°
is called
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Fahrenheit
Kelvin
absolute
Celsius
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Question # 39
The total K.E. of one mole of an ideal gas is given by:
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1/2 RT
3/2 RT
1/2 KT
3/2 KT
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Question # 40
The substitution of a'-H' by '-NO2' group in benzene is called
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Nitration
Sulphonation
Ammunolusis
Reduction of benzene
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Question # 41
The pressure of gas at constant temperature in a container of 2dm3 is 10 atm what will be its final pressure if it is connected with 10 dm3 container
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2 atm
1.6 atm
5 atm
I atm
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Question # 42
What is the formula of magnesite?
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PbS
MgSO4. 7H2O
MgCO3
CaCO3
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Question # 43
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 # 44
Total pressure of mixture of two gases is:
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The ratio of their partial pressure
The product of their partial pressure
The difference partial pressure
The sum of their partial pressure
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Question # 45
Out of monochloro, monobromo and mongiodo derivatives of ethane, the mos reactive compound towards nucleophilic substitution will be
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C2H5Br
C2H5Cl
C2H5I
All are equally reactive
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Question # 46
Which of the following is soluble in water?
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СН3ОН
CCL4
CHCI3
CS2
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Question # 47
The common oxidation number of halogens is
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-1
+1
-2
0
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Question # 48
The forces of attraction between the solid atoms of helium are
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hydrogen boding
coordinate covalent bond
covalent bond
London dispersion force
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Question # 49
Air at sea level is dense.This is a practical application of
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Boyle's law
Charle's law
Avogadro's law
Dalton's law
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Question # 50
Air contains 78% N
2
, 21% O
2
and 1% other gases at sea level the partial pressure of O
2
is
Choose an answer
760 torr
159 torr
592 torr
7.6 torr
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Question # 51
Which of the following statement is not true?
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The pressure of a gas is due to collision of the gas molecules with the walls of the container.
The molecular velocity of any gas is proportional to the square root of the absolute temperature.
The rate of diffusion of a gas is directly proportional to the density of the gas at constant pressure.
Kinetic energy of an ideal gas is directly proportional to the absolute temperature.
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Question # 52
Which of the following statement about the order of reaction is true?
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The order of reaction can only be determined by experiment
a second order reaction is also bimolecular
The order of reaction is always non-zero
The order of reaction increases with increasing temperature
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Question # 53
At constant temperature when pressure of a gas is plotted against volume, the curve is:
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Slanting straight line.
Parabolic.
Straight line, parallel to pressure axis.
Of neither type.
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Question # 54
Ethene C
2
H
4
and N
2
gases diffuse at the same rate at room temperature. it is due to the reason
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these are non polar gases
their molecular masses are same
both are covalent molecules
both have multiple bonds
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Question # 55
The geometry of diamonds is
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tetragonal
cubic
rhombohedral
none of these
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Question # 56
Value of gas constant R is
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8.314 J K
-1
mol
-1
0.082 J K
-1
mol
-1
273.15 J K
-1
mol
-1
101325 J K
-1
mol
-1
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Question # 57
Relative acidic strength of alcohol, phenol, water and carboxylie acid is
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Carboxylic acid > Alcohol > Phenol > Water
Carboxylic acid > Phenol > Water> Alcohol
Water > Alcohol> Phenol > Carboxylic acid
Phenol > Carboxylic acid > Alcohol> Water
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Question # 58
What is distilled first?
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Liquid CO
2
Liquid N
2
Liquid O
2
Liquid H
2
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Question # 59
The number of Na+, ions which surround each Cl- ion in the NaCl crystal lattice is
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8
12
6
10
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Question # 60
An element from the given below exists as discrete small molecules in the solid state. Which is that?
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Sodium
Silicon
lodine
lron
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Question # 61
Which one of the following will react with bothethand and ethanoic acid at room temperature
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CaCO3
CuO
Na-metal
CH3OH
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