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MDCAT Chemistry Online Test MCQs With Answers
Question # 1
The existing property of an element in to more than are crystalline state is termed as:
Choose an answer
isomorphism
polymorphism
isotropy
allotropy
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Question # 2
During space flights, astronauts ohlained water from
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Nickel cadmium cells
Lead accumulator
Fuel Cell
Alkaline battery
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Question # 3
pH of 10-4 mole dm-3 of HCl
Choose an answer
2
4
3
5
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Question # 4
The question vapour cause by heating a liquid is due to:
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increase of intermolecular interactions
increase of K.E of molecules
decrease of surface tension
increase in potential energy of molecules
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Question # 5
A graph is plotted, P on x-axis and V on y-axis for a given mass at constant temperature, we shall get:
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a curve with different peaks
a curve called isotherm
straight line parallel to x-axis
a straight line
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Question # 6
In order to determine ∆H (latt) of ionic compound which is correct relationship
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∆H latt. = ∆Hf - ∆Hx
∆H latt. = ∆Ha + ∆Hv
∆H latt. = ∆Hf + ∆Hx
∆H latt. = ∆Hf - ∆H sol.
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Question # 7
Which of the following is pseudosolid?
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CaF
2
Glass
NaCl
All
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Question # 8
in diamond a unit cell is tetrahedral and averall crystai structure is
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face centred cubic
body centred cubic
tetrahedral
hexagonal
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Question # 9
The cell which converts electrical energy to chemical energy is called
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Electrochemical cell
Voltaic cell
Galvanic cell
Down's cell
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Question # 10
Reaction kinetics is important to discover the---under which reaction will proceed most economically:
Choose an answer
rate constant
Conditions
volume
equilibrium point
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Question # 11
Glycerine is a polar compound. It boils at 290°C under one atmospheric pressure. It should be distilled under reduced pressure due to reason that
Choose an answer
there are strong intermolecular forces between molecules of glycerine
it decomposes at 290°C
low pressure makes the liquid to boil at high temperature
the reduced pressure decreases the boiing point of liquids
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Question # 12
Compressibility factor for an ideal gas is
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1.5
1.0
2.0
0.5
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Question # 13
Diamond and silicon carbide are insoluble in all solvents because
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they have high melting and boiling points
absence of three electrons
they are huge giant three dimensional molecules (macromolecules)
their unit cells have tetrahedral geometry
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Question # 14
Which compound gives carbon when heated with conc. H2SO4.
Choose an answer
Starch
Ethyl alcohol
Oxalic acid
Formic acid
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Question # 15
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 # 16
Cl
2
is a gas while iodine is a solid due to
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stronger London forces with high polarizability
greater electro negativity of Cl than iodine
stronger dipole dipole forces
iodine is colored while chlorine is colourless
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Question # 17
The kinetic energy of three moles of gas is:
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3/2 RT
3 RT
1/2 RT
2 RT
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Question # 18
Which of the following ketone will not give iodoform test
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Methyl isopropyl ketone
Dimethyl ketone
Ethyl isopropyl ketone
2-hexanone
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Question # 19
covalent network of crystals has:
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lower melting point than molecular crystals
higher melting point than molecular crystals
higher melting point than molecular crystals
H-bonding
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Question # 20
Benzene reacts with Ethyl chloride in presence of AICls to give
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Benzalchloride
Benzyl chloride
Ethyl benzene
Benzotrichloride
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Question # 21
Liquefaction of gas can only be carried out if the:
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without caring for the value critical volume at critical stage
the temperature is more than critical and pressure is 1000 atm
the temperature is below the critical and pressure is very high
temperature is above the critical temperature and pressure can have any value
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Question # 22
Wt. of 112 ml of oxygen at NTP on liquifaction would be
Choose an answer
0.32 g
0.64 g
0.16 g
0.96 g
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Question # 23
For gas obeying Boyle's law if pressure is double, the volume becomes:
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Remains constant.
Double.
One half.
None of above.
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Question # 24
Which of the following formula is correct for density of any gas
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d = RT/PM
d = PM/RT
d = MT/PR
d = RM/PT
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Question # 25
The partial pressure of 0
2
in the lungus is
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116 torr
159 torr
560 torr
760 torr
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Question # 26
Phenol is completely soluble in water above
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25°C
62.3℃
68.5°C
66.50°c
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Question # 27
lonic bond is produced after complete transfer of
Choose an answer
nucleus
neutrons
electrons
protons
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Question # 28
In beta elimination reaction
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carbon number changes
unsaturated compound is formed
hybridization. ofC remains same
pi bonds are decreased
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Question # 29
In Case of elements the polymorphism is called
Choose an answer
Isotopic form
Allotropy
Isomorphism
Crystalline forms
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Question # 30
At what temperature, would N
2
molecules have the same average speed as He-molecules at 300 k?
Choose an answer
1100 K
2100 K
420 K
None
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Question # 31
Nitro alkanes exhibit the:
Choose an answer
Chain isomerism
Positional isomerism
Functional group
Metamerism
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Question # 32
Deep sea divers breath air under increased pressure, therefore they use a mixture of
Choose an answer
96% N
2
and 4% O
2
96% O
2
and 4% N
2
94% N
2
and 6% O
2
94% 0
2
and 6% N
2
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Question # 33
If the concentration of salt is greater than the acid in buffer solution, then the
Choose an answer
pH = pKa
pH = pKb
pH > pKa
pH < pKb
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Question # 34
In the transition state of S2 mechanism reaction with alkyl halides, which of the following orbital hybridization is involved
Choose an answer
sp³
sp
sp²
dsp³
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Question # 35
Which of the elements has seven electrons in d-subshell?
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Zn
Co
Cu
Fe
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Question # 36
Freshly cut metals have a shining surface because
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electrons excited, then excited electrons release energy as light
metals have brittle nature
metals conductivity increases
metals are malleable and ductile
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Question # 37
Enthalpy of a system can be calculated by which of following relationship
Choose an answer
q=ΔΕ
q=m×S×∆T
q=pv
q=m×v×∆T
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Question # 38
A graph between P and PV constant temperature and number of moles is parallel to:
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Y-axis
X-axis
Z-axis
Pressure axis
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Question # 39
A compound X has all of the properties below. It is a liquid at 25°C it mixes completely with water it reaets with aqueous sodium hydroxide, What could X be?
Choose an answer
Ethanoic acid
Ethene
Ethanol
Ethyl ethanoate
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Question # 40
Which of the following acid is unsaturated carboxylie acid
Choose an answer
Malonic acid
Oxalic acid
Succinic acid
Maleic acid
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Question # 41
The deviation of a real gas from ideal behaviour is maximum at
Choose an answer
-10.0
°C and 50 atm
-10
°C and 2 atm
100
°C and 2.0 atm
0
°C and 2 atm
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Question # 42
Which of the following molecules has angel of 120°
Choose an answer
BeCl2
BF3
CH4
NH3
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Question # 43
Enzymes have been classified on the basis of
Choose an answer
protein structure
prosthetic groups
type of reaction they catalyse
bonding in them
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Question # 44
The element with highest E°red
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N
F
O
CI
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Question # 45
The reaction kinetics concerned with the
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Rate of reaction
Direction of reaction
Factor effecting rate of reaction
both a &b
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Question # 46
At ordinary temperature, the most nearly ideal gases are
Choose an answer
N
2
He
H
2
all these
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Question # 47
Number of electrons involved in d-d transition of [Ti(H2O)6]+3
Choose an answer
1
3
2
4
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Question # 48
Kinetic energy of one mole of an ideal gas at 300 K in kJ is
Choose an answer
34.8
3.48
3.74
348
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Question # 49
An electron with drawing group attached to e-position in phenol
Choose an answer
makes it basic
Stabilises the phenoxide ion
decreases its basicity
allows it to precipitate in aqueous solution
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Question # 50
The value of Kc for H2O at 25C° is
Choose an answer
1x10 (-14)mole dm-3
14 mol dm-3
1.86×10(-16) mol dm-3
1.0x10 (-7)moldm-3
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Question # 51
Van der Waals equation explains the behaviour of
Choose an answer
Real gases
Mixture of gases
Ideal gas
Diatomic gases
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Question # 52
At higher temperature isotherm of Boyle's law moves away from both axis, is due to increase in
Choose an answer
pressure
No. of moles
Volume
all of these
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Question # 53
The nature of crystals formed due to London forces of interaction are
Choose an answer
molecular
metallic
ionic
covalent
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Question # 54
The sun is a ball of plasma heated by nuclear fusion is
Choose an answer
1.0 million km
2.0 million km
1.5 million km
2.5 million km
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Question # 55
which of the following d blocks element can showthe highest oxidation number is its ompound
Choose an answer
Chromium
iron
Copper
Manganese
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Question # 56
Which one of the following alcohol is indicated by formation of yellow crystals in lodoform tesr?
Choose an answer
Methanol
Ethanol
Butanol
Propanol
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Question # 57
The Complete oxidation of ethanol produces first Ethanal than
Choose an answer
Ethanal
Propanone
Ethanoic acid
Benzoic acid
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Question # 58
Anthracene contains number of fused benzene rings
Choose an answer
1
2
3
4
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Question # 59
The volume of an ideal gas is decreased to half, What will happen to the force exerted on the walls of the container by the gas particles?
Choose an answer
the force is halved
the force increases by a factor of 4
the force remains constant
the force increased by a factory of 2
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Question # 60
Which of the following is a base according to lowery Bronsted concept?
Choose an answer
I-1
HCl
H3O+
NH4+1
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Question # 61
NH
3
shows a maximum boiling point among the hydrides of V-A group elements due to :
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very small size of nitrogen
lone pair of electrons present on nitrogen
enhanced electronegative character of nitrogen
pyramidal structure of NH
3
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