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MDCAT Chemistry Online Test MCQs With Answers
Question # 1
Surface tension is measured by
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viscometer
barometer
stalagmometer
manometer
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Question # 2
Which of the following has isomorphous structure with MgO
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NaF
S
Sn
N
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Question # 3
Which of following is oxidation state of oxygen in peroxides?
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-2
1/2
-1
+2
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Question # 4
Which thermometer will have its reading 273 degrees greater than that of thermometer C?
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A
B
B has 273 degrees greater than A
C has greater reading than all other thermometers
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Question # 5
The elements of group I-A react violently with water and make the solution
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neutral
amphoteric
acidic
alkaline
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Question # 6
Density of a gas is usually expressed in
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Kg m
3
Kg dm
3
g dm
-3
g cm
-3
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Question # 7
Calorie is equivalent to
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0.4184J
4.184J
418.4J
40.18J
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Question # 8
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 # 9
What are the conditions under which the relation between volume (V) and number of moles (n) of gas is plotted? (Pressure; T-temperature)
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constant P and T
constant P and V
constant T and V
constant n and v
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Question # 10
One Pascal is equal to
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1 Nm
-2
1 Nm
1 Nm
-1
1 Nm
2
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Question # 11
Which one is very weak acid
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HF
HCI
H2CO3
H2O
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Question # 12
Molecular ions are produced in mass spectrometer. Which type of molecular ion formed more abundantly.
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Negatively charged
H⁺ ions
Positively charged
equal positive and negative ions
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Question # 13
Equal masses of methane and oxygen are mixed in an empty container at 25∘C.
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1/3
8/9
1/9
16/17
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Question # 14
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 # 15
Which class of compound cannot show positional isomerism?
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Alkanes
Alkene
Alkynes
Alcohol
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Question # 16
In which of the following compounds H-binding is not present?
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ethanol
ether
water
ammonia
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Question # 17
Born-Haber cycle is an application of
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Hess's law
1" law of thermodynamics
Avogadro's law
1law of thermochemistry
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Question # 18
Chloroform (CHCl3) is?
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Primary alkyl halide
Secondary alkyl halide
Tertiary alkyl halide
a liquid
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Question # 19
In Boyle's law which of the following pair is variable:
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Temperature and quantity of a gas.
Pressure and volume.
Volume and quantity of a gas.
Pressure and quantity of a gas.
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Question # 20
The heat of hydrogenation of most of the alkene is about
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120 kJ/mol
100 kJ/mol
140 kJ/mol
105 kJ/mol
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Question # 21
The molecule of CO
2
in dry ice form are the:
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ionic crystals
covalent crystals
molecular crystals
any type of crystals
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Question # 22
The boding which covalent molecules containing hydrogen and one of the small electronegative element such as O, For Mis called:
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ionic bonding
bridge bonding
H-bonding
metalic bonding
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Question # 23
In crystal structure of sodium chloride,the arrangement of CI
-
ions is
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Fcc
Both fcc and bcc
Bcc
None of these
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Question # 24
A gas has non-ideal behaviour at:
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high temperature and high pressure
low temperature and low pressure
high temperature and low pressure
low temperature and low pressure
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Question # 25
What types of bonds are broken when water turns into steam on heating?
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covalent
permanent dipole interactions
hydrogen bonds
induced dipole interactions
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Question # 26
lonic solids don't conduct the electrical current because
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ion do not have translatory motion
free electrons are less
the coordination number of the ion is very high
strong covalent bonds are present in their structure
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Question # 27
Which of the following is an example of body centred cube?
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Magnesium
Zinc
Copper
Sodium
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Question # 28
Substituted phenyl group are called
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Arene groups
Alkyl groups
Aryl groups
Acyl groups
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Question # 29
Which of the following is not an electrophilic substitutional reaction of benzene?
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Free radical chlorination of benzene
Friedel Craft alkylation
Sulphonation
Nitration
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Question # 30
All are examples of different classes of enzymes except
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Hydrolases
Isomerases
Oxido-reductases
Mutases
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Question # 31
Succinic thiokinase is an enzyme of the type
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mutase
peroxidase
ligase
lyase
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Question # 32
The relationship which describes the variation of vapour pressure with temperature is called
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Hess's law
Arrhenius equation
Kirchhoff's law
Clausius-Clapeyron equation
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Question # 33
About 25% of earth crust mass is made up of element
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Oxygen
Silicon
Aluminium
Aluminates
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Question # 34
2-propanol on oxidation yield
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Propionaldehyde
Propanone
Propanal
Butanal
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Question # 35
Which of the following processes has always. ∆H=-ve
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Formation of compound
Dilution of a solution
Dissolution of ionic compound
Combustion
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Question # 36
Which one of following statement about three about three states of matter is incorrect?
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in solids the particles vibrate about fixed positions
energy is released when a gas turns back to a liquid
particles in gases move in a random manner
the closer particles are together, smaller the force of attraction between them
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Question # 37
Low IE is a symbol of
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high electronegativity
small size
High electron affinity
Metallic character
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Question # 38
According to kinetic theory of gases kinetic energy depends on
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Temperature
Collision
Pressure
Atomic number
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Question # 39
Helium atom is two times heavier than a hydrogen molecule. At 298 K, the average kinetic energy of a helium atom is
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same as that of a hydrogen molecule
half that of a hydrogen molecule
two times that of a hydrogen molecule
four times that of hydrogen molecule
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Question # 40
The stoichiometric calculations for a chemical reaction results in
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Actual yield
Percentage yield
Theoretical yield
Selectivity
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Question # 41
Plastics are amorphous solids and
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have sharp melting points
undergo clean cleavage when cut with knife
do not undergo clean cleavage
possess orderly arrangement over long distances
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Question # 42
lonic bond is produced after complete transfer of
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nucleus
neutrons
electrons
protons
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Question # 43
The average kinetic energy of an ideal gas per molecule is SI units at 25°C will be
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6.17 x 10
-21
KJ
6.17 x 10
-21
J
6.17 x 10
-20
J
7.16 x 10
-20
J
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Question # 44
The solubility of A2B3 is X mole dm-3. Its Ksp is?
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6X(5)
36X(5)
64X(5)
108X(5)
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Question # 45
Which of the following is an application of electrochemical series
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Prediction of the feasibility of chemical reaction
Calculation of the cell voltage
Prediction of reaction of metal with dilute acid
All of the above
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Question # 46
General gas equation is combination of
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Boyle s law
Avogadro s law
Charles s law
All of these
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Question # 47
Which one of the following alcohol is indicated by formation of yellow crystals in lodoform tesr?
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Methanol
Ethanol
Butanol
Propanol
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Question # 48
Total number of valence electrons in CH4
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8
9
10
12
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Question # 49
The electrical conductivity of the metals decreases with the increasing temperature. This is because
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the number of free electrons decrease
the bonds of the metal atoms become weak
the to and fro motion of the metal ions decrease
the increase of to and fro motion of the metal ions hinders the free movement of electrons
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Question # 50
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 # 51
Phosphoprotein comes under the type of proteins
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Simple protein
Derived protein
Conjugated
Both A & B
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Question # 52
Number of moles present in 0.6 gram of silica is (Atomic mass Si = 28, O=16)
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0.01 mole
0.064 mole
0.044 mole
0.054 mole
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Question # 53
Which of the following is a strong acid
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CH3COOH
C2H5OH
HCOOH
Phenol
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Question # 54
The intramolecular forces in gases are:
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Weak.
Normal.
Very weak.
Strong.
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Question # 55
All the following have crystals except:
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potassium bromide
diamond
cadmium sulphide
sodium chloride
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Question # 56
Some of crystals are good conductors of heat and electricity, they may be
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ionic in nature
of metallic character
covalent in nature
of molecular nature
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Question # 57
Which one of the following gases has lowest density at room temperature:
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NH
3
Ne
N
2
CO
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Question # 58
The crystal system are of
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7 types
10 types
5 types
8 types
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Question # 59
The number of moles of H2 in 0.224 L of hydrogen gas at STP (273 K, 1 atm) assuming ideal gas behaviour is
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1
0.1
0.01
0.001
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Question # 60
The volume occupied by 1.4g of N2at STP is:
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2.24 dm3
1.12 dm3
112 cm3
22.4 dm3
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Question # 61
NaCl is completely ionized in water due to presence of
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hydrogen bonding
dipole dipole forces
ion dipole forces
London dispersion forces
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