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MDCAT Chemistry Online Test MCQs With Answers
Question # 1
The reaction which is responsible for the production of electricity in the voltaic cell is
Choose an answer
Hydrolysis
Oxidation
Reduction
Redox
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Question # 2
Which does not affect vapour pressure
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Nature of liquid
intermolecular forces
Temp
None of these
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Question # 3
Which of the following tests helps to distinguish between alkyne and alkene?
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Lucas test
Tollen's reagent test
Baeyer's test
Fehling's solution test
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Question # 4
One degree on Celsius scale is ______ time greater then Fahrenheit scale
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9/5
5/9
6/5
5/6
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Question # 5
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 # 6
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 # 7
The deviation of a gas from ideal behaviour is maximum at
Choose an answer
-10°C and 5.0 atm
100°C and 2.0 atm
-10°C and 2.0 atm
0°C and 2.0 atm
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Question # 8
Pyridine is an example af
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Homocyclic compound
Heterocyclic compound
Carbocyclic compound
Aliphatic compound
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Question # 9
The exothermic process is
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Evaporation
Sublimation
Respiration
Boiling
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Question # 10
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 # 11
NH
3
gas is liquefied more easily than N
2
Hence
Choose an answer
Van der Waals constants a and b of NH
3
> that of N
2
Van der Waals constants a and b of NH
3
< that of N
2
a(NH
3
) > a (N
2
) but b (NH
3
) < b(N
2
)
a (NH
3
) < a (N
2
) but b (NH
3
) > b (N
2
)
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Question # 12
Which gas diffuses more rapidly?
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O
2
SO
3
NH
3
H
2
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Question # 13
Which is the incorrect value of gas constant R?
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2.987 cal k
-1
mol
-1
3.313 Nmk
-1
mol
-1
62400dm
3
atm k
-1
mol
-1
1.10821atm dm3k
-1
mol
-1
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Question # 14
In a closed vessel a gas is heated from 300 K to 600K The kinetic energy becomes remains
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Double
Same
Half
Four times
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Question # 15
All of the following have cleavage planes except:
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molecular crystals
metallic crystals
covanent crystals
ionic crystals
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Question # 16
The product of pressure and volume remains constant when temperature and quantity of gas is:
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Zero
Variable
Kept constant
None of above
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Question # 17
The mono atomic gas molecules are ______ gas molecules
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Halogen
Zero
Noble
Both b and c
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Question # 18
Which of the following is primary alkyl halide
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IsopropyI halide
Sec-butyl halide
Tert-buryi halide
Neo-pentyl halide
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Question # 19
Which one of the following pair of atoms is most likely to form an inoic bond?
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Na and F
C and F
N and F
O and F
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Question # 20
To prepare ethane by Wurtz synthesis the suitable alkyl halide is
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Ethyl iodide
any alkyl iodide
Ethyl chloride
Methyl bromide
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Question # 21
All of following acids have hydrogen bond in liquid state except:
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nitric acid
sulphuric acid
hydrochloric acid
hydrofluoric acid
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Question # 22
The oxidation of 1 - propanol in the presence of H2SO4, +K2Cr207 produces final product
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Acetaldehyde
Propanal
Acetone
Propanoic acic
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Question # 23
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 # 24
The conversion of tertiary alcohols into alkenes in the presence of K2Cr2O7 + H2SO4 is
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Addition reaction
C-H bond cleavage
Elimination reaction
Combustion reaction
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Question # 25
The strongest conjugate base is
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OH-
CH3O-
C6H5O-
CH3COO-
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Question # 26
Benzene reacts with Ethyl chloride in presence of AICls to give
Choose an answer
Benzalchloride
Benzyl chloride
Ethyl benzene
Benzotrichloride
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Question # 27
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 # 28
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 # 29
CO
2
gas is dissolved in water due
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dipole-dipole interactions
higher molecular mass of CO
2
ion dipole attractive forces
hydrogen bonding
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Question # 30
Acording to the kinetic theory of gases
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The pressure exerted by a gas is proportional to mean square velocity of the molecules
The pressure exerted by the gas is proportional to the root mean square velocity of the molecules
The root mean square velocity is inversely proportional to the temperature
The mean translational KE of the molecule is directly proportional to the absolute temperature
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Question # 31
What is true for a molecule with standard geometry
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It lacks a Ip
It can't be a donor
It can be an acceptor
All
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Question # 32
2,5-dimethyl-1-hexene has
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Two sp2 hybridized carbons
Six sp2 hybrid carbons
Two double bonds
Four pi electrons
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Question # 33
Keeping the temperature constant, if the gas is expended:
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Kinetic energy of molecules will increase.
Number of gas molecules increases.
Temperature will increase.
Pressure will decrease.
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Question # 34
If empirical formula of a compound is CH2 and its molecular mass is 56amu. What will beits molecular formula
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CH2
C3H6
C2H4
C4H8
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Question # 35
At what temperature, would N
2
molecules have the same average speed as He-molecules at 300 k?
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1100 K
2100 K
420 K
None
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Question # 36
Which compound is obtained hy the elimination reaction on bromoethane?
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Butene
Ethene
Propene
Propane
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Question # 37
The average kinetic energy of an ideal gas per molecule is SI units at 25°C will be
Choose an answer
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 # 38
The existence of an element in more than one form is called
Choose an answer
allotropy
isomorphism
polymorphism
isotropy
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Question # 39
Gases of air, always remain in random motion and do not settle due to:
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Difference of molecules masses of air gases.
Difference in partial pressure of gas molecules.
Unequal number of different gas molecules.
Elastic collision of gas molecules.
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Question # 40
A graph between P and 1/V at constant temperature and number of moles of a gas meets the:
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Y-axis
X-axis
Origin
None of above
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Question # 41
In homocyclic compounds the ring consists of
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Carbon and oxygen atoms
Carbon and nitrogen atoms
Only carbon atoms
Carbon atoms with one hetero atom
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Question # 42
When HCI gas is passed through saturated solution of rock salt, the solubility of NaCl
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Increases
May increase or decrease
Decreases
None of these
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Question # 43
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 # 44
At freezing point of water, the density decreases due to
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change of bond angles
change of bond lengths
cubic structure of ice
empty spaces present in the structure of ice
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Question # 45
Among the following molecules, which one has coordinate covalent (dative) bond?
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CCI4
CO2
CO
CH4
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Question # 46
Charles's law is only obeyed at which temperature scale
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Celsius
Kelvin
Fahrenheit
both A&B
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Question # 47
what is the exact value of angle in BF3
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90
104.51
119.5
120°
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Question # 48
Prosthetic groups are
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helical structures in protein
sulphur containing parts of protein
non-protein parts in compound proteins
sites for hydrogen bonding
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Question # 49
The density of methane at 2.0 atmosphere pressure at 27°C is
Choose an answer
0.13 gL
-1
0.26 gL
-1
1.30 gL
-1
26.0 gL
-1
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Question # 50
The volume of given mass of gas is directly proportional to absolute temperature when pressure is kept constant this is called
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Boyle's law
Charles's law
Graham's law
Dalton's law
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Question # 51
What is not correct about ∆HF
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It is always negative
Ìts value gives an idea about the relative stability of reactants and the products.
Its value can be greater or less than zero
Value depends upon nature of bonds
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Question # 52
The correct order of increasing attractive strength for weak intermolecular forces is....
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dipole-dipole interaction hydrogen bonding, van der Waals forces
van der waals forces dipole- dipole interaction, hydrogen bonding
hydrogen bonding, dipole-interaction, van der Waals forces
hydrogen bonding, van der Waals forces, dipole-dipole interaction
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Question # 53
which of the following d blocks element can showthe highest oxidation number is its ompound
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Chromium
iron
Copper
Manganese
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Question # 54
The deviation of a gas from ideal behavior is maximum at:
Choose an answer
-10∘C and 5.0 atm
-10∘C and 2.0 atm
100∘C and 2.0 atm
0∘C and 2.0 atm
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Question # 55
In the formation of NaCl crystals from its aqueous solution, its cubic shape is changed to needle like when 10% urea is present as impurity, this phenomenon is called as
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habit of crystal
polymorphism
anisotropy
cleavage
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Question # 56
All gases liquefly before reaching at
Choose an answer
273
°K
373
°K
0 K
73
°C
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Question # 57
Most reactive among the following
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Li
Mg
Ca
Na
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Question # 58
Pressure of 1Nm
-2
is equal to
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One bar
1 psi
One pascal
One atmosphere
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Question # 59
Hydrogen bonding is extensively present in proteins which form the spiral. The hydrogen bond being produced is between
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nitrogen and hydrogen atom
oxygen and hydrogen atom
carbon and hydrogen atom
oxygen and carbon atom
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Question # 60
The vapour pressure of a liquid depends upon
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amount of the liquid
surface area
temperature
size of container
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Question # 61
Instantaneous dipole-induced dipole forces are also known as:
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dipole-dipole interactions
hydrogen bonds
covlent bonds
Van der Waals forces
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