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MDCAT Chemistry Online Test MCQs With Answers
Question # 1
In order to maintain the boiling point of water at 110 C°, the extemal pressure should be
Choose an answer
550 torr
between 500 and 760 tor
between 760 and 1500 torr
any pressure can be maintained
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Question # 2
Covalent solids are composed of
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Ions
Different molecules
Neutral atoms
Diethyl ether
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Question # 3
Liquids are less common than:
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Solids.
Plasmas.
Gases.
All of above.
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Question # 4
In crystal structure of sodium chloride,the arrangement of CI
-
ions is
Choose an answer
Fcc
Both fcc and bcc
Bcc
None of these
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Question # 5
Which of the following gases have maximum root mean square velocity at 25°C:
Choose an answer
SO
2
NH
3
CO
2
H
2
S
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Question # 6
Which of the followings has electronic configuration of Ar in +3 oxidation state
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Sc
Mn
Ti
Zn
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Question # 7
Density of a gas is usually expressed in
Choose an answer
Kg m
3
Kg dm
3
g dm
-3
g cm
-3
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Question # 8
Real gases deviate at low temperature from ideal behaviour due to
Choose an answer
there is transitional motion of molecule
the collissions between the molecules are decreased
volume of gas is decreased
the inter molecular attractive forces become significant
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Question # 9
Equal volumes of ideal gases contain equal number of molecules at:
Choose an answer
Same temperature
Same pressure
Same environmental conditions
Both (A) and (B)
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Question # 10
Theoretically, the temperature at which volume of gas become equal to zero is called
Choose an answer
Boiling point of water
Zero absolute
Zero Kelvin
both B and C
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Question # 11
The maximum possible number of hydrogen bonds in which a H
2
O molecule can participate is
Choose an answer
1
2
3
4
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Question # 12
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 # 13
Which of the following is a non-typical transition element?
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Cr
Zn
Mn
Fe
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Question # 14
At higher temperature isotherm moves away from both the axes because of increase in
Choose an answer
Pressure
Volume
Number of moles
All
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Question # 15
Which noble gas is used in mixture used for breathing by divers?
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Ge
Ar
Kr
He
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Question # 16
Which of the following solids does not have a covalent bond?
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Silica
Copper
Diamond
Graphite
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Question # 17
Which of the following contains maximum of number of molecules?
Choose an answer
100 cc of CO
2
at STP
150 cc of N
2
at STP
50 cc of SO
2
at STP
200 cc of NH
3
at STP
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Question # 18
The conversion of tertiary alcohols into alkenes in the presence of K2Cr2O7 + H2SO4 is
Choose an answer
Addition reaction
C-H bond cleavage
Elimination reaction
Combustion reaction
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Question # 19
Gases deviate from ideal behaviour at high pressure.Which of the following is correct for non-ideality?
Choose an answer
at high pressure the gas molecules move in one direction only
at high pressure the collisions between the gas molecules are increased manifold
a high pressure the volume of the gas become insignificant
at high pressure, the intermolecular attraction becomes significant
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Question # 20
Among solids,the highet melting point is exhibited by
Choose an answer
Covalent solids
Ionic solids
Pseudo solids
Molecular solids
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Question # 21
If a reaction involves only solids and liquids, which of the following is true?
Choose an answer
ΔH = ΔE
ΔΗ =ΔΕ
ΔH>ΔΕ
AH =AE +nRT
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Question # 22
Which of the following best describes the shape and polarity of the carbon disulphide molecule?
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Bent and polar
Linear and non-polar
Pyramidal and polar
Bent and non-polar
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Question # 23
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 # 24
Propanoic acid is functional group isomer of
Choose an answer
Methyl acetate
Ethyl acetate
Propanal
Proparone
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Question # 25
For which mechanisms, the first step involved is the same
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E1 and E2
E2 and SN2
E2 and E1
E1 and SN1
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Question # 26
Which one is an isomorphic pair?
Choose an answer
NaNO3, CaCO3,
NaF, MgO
K2SO4 ,K2Cr2O7
Zn, Cd
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Question # 27
suppose that an ocean of mercury replaced all the air of the air of the earth . How deep would this ocean have to be to exert the same pressure as the air:
Choose an answer
77cm
76cm
79cm
78cm
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Question # 28
The electrical conductivity of the metals decreases with the increasing temperature. This is because
Choose an answer
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 # 29
The forces of attraction between the solid atoms of helium are
Choose an answer
hydrogen boding
coordinate covalent bond
covalent bond
London dispersion force
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Question # 30
According to Boyle's law at constant temperature, the product of pressure and volume of a given mass of gas is:
Choose an answer
a constant
fraction
whole number
a multiple
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Question # 31
Which is trigonal cyrstal
Choose an answer
BaSO
4
. 4H
2
O
FeSO
4
NaNO
3
None
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Question # 32
Equal masses of CH
4
and O
2
are mixed in a 10 dm
3
container at 25
°C. The partial pressures of CH
4
and O
2
are in the ratio of
Choose an answer
1 : 2
2 : 1
1 : 1
2 : 3
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Question # 33
The collision which results in chemical reaction
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Effective collision
Ineffective collision
Useless collision
All of the above
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Question # 34
Which liquid is more volatile?
Choose an answer
water
mercury
benzene
honey
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Question # 35
London forces are
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stronger than dipole-dipole interactions
weaker than dipole-dipole interactions
equal to dipole-dipole interactions
sometimes stronger and sometimes weaker than dipole-dipole interactions
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Question # 36
The density of ice is 1.00gcm
-3
.
What the volume of steam produced when 1.00-3 of ice is heated to 323
∘C (596K) at a pressure of one atmosphere (101kPa)?
[1 mol a gas occupies 24.0dm
3
at 25a
∘
C(295K)and one atmosphere.]
Choose an answer
0.267 dm
3
1.33 dm
3
2.67 dm
3
48.0 dm
3
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Question # 37
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 # 38
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 # 39
Stability of Cu-metal is due to filled of d-orbital
Choose an answer
Half
Completely
Partially
Quarterly
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Question # 40
The partial pressure of gas can be calculated if we know total pressure of mixture and:
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Number of protons
Number of electrons
Number of neutrons
Mole fraction of gases
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Question # 41
In metallic crystals the atomic orbitals combine to produce a large number of closely bands of energy according to
Choose an answer
electron pool theory
molecular orbital theory
valence bond theory
electrostatic force of attraction
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Question # 42
The strength of binding energy of transition elements depends upon
Choose an answer
Number of electron pairs
Number of unpaired electrons
Number of neutrons
Number of protons
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Question # 43
During combustion analysis, which one is used for absorbing carbon dioxide:
Choose an answer
50% KOH
5% KOH
Mg(ClO4)2
Silica gel
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Question # 44
Octet rule is not allowed in the formation of
Choose an answer
NF3
B.CF4
CCI4
PCI5
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Question # 45
The unit of R depends on
Choose an answer
Mole
Pressure volume
Temperature
None of these
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Question # 46
For reaction of methane and chlorine light is not available then
Choose an answer
Reaction will take place rapidly
No Reaction take place
Reaction occurs at double the rate
May all cases occur
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Question # 47
Freshly cut metals have a shining surface because
Choose an answer
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 # 48
Dalton's law finds its application during the process of:
Choose an answer
Digestion
Respiration
Reproduction
All of above
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Question # 49
Alpha helix and beta pleated sheath are secondary structures of protein which are maintained by
Choose an answer
dipole forces
non-polar interactions
ionic bonds
Hydrogen bonds
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Question # 50
A system absorbs 100 kJ heat and performs 50 kJ work on the surroundings. The increase in internal energy of the system is
Choose an answer
50kJ
100 kJ
150kJ
5000 kJ
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Question # 51
In dilatometric method is directly proportional to extent of reaction
Choose an answer
Change in concentration
Change in pressure
Chang in volume
Change in temperature
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Question # 52
The molecules of CO
2
is dry ice form the
Choose an answer
ionic crystals
covalent crystals
molecular crystals
any type of crystal
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Question # 53
The enzyme which is found in saliva, accelerates the conversion of starch into sugar is
Choose an answer
Pepsin
Thrombin
Ptyalin
Fumarase
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Question # 54
Choose the correct equation among the following given by clauslus to understand to behaviour of molecules:
Choose an answer
PV =nRT
C
r.m.s
= √3RT/M
d = PM/RT
PV = 1/3mnc
-2
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Question # 55
Elastic collision involves:
Choose an answer
gain of energy
loss of energy
no relationship between elastic
no gain or loss of energy
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Question # 56
Velaric acid is obtained from a herb velarian, its IUPAC name is
Choose an answer
Propionic acid
Pentanoic acid
Butyric acid
Caporic acid
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Question # 57
Dipole-dipole forces are present between:
Choose an answer
non-polar molecules
polar molecules
both polar and non-polar
none pf above
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Question # 58
The non polar gases of low polarizability have a very:
Choose an answer
Low critical temperature
Stable critical temperature
High critical temperature
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Question # 59
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 # 60
In which of the following techniques rate of reaction is directly related with number ofions
Choose an answer
Spectrometry
Dilatometric method
Conductometric method
Refractometric method
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Question # 61
Correct statement about Nucleophilic substitution bimolecular is
Choose an answer
Transition state is formed
Inversion take place
It is two step reacticn
Both a &c
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