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MDCAT Chemistry Online Test MCQs With Answers
Question # 1
The formation of ester from acetic aciad in presence of acid and ethanol is a
Choose an answer
Nucleophilic substitution reaction
Nucleophilic addition reaction
Electrophilic substituion reaction
Electrophilic addition reaction
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Question # 2
Diffusion of different species is due to difference of
Choose an answer
potential energy
temperature
density
all the above
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Question # 3
If temperature is 73K and volume is 146 cm3 then calculate the value of K=V/T
Choose an answer
5
4
3
2
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Question # 4
Theoretically, the temperature at which volume of gas become equal to zero is called
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Boiling point of water
Zero absolute
Zero Kelvin
both B and C
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Question # 5
One of the best applications of Hess's law to calculate the lattice energy of ionic compound is
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Measurement of enthalpy change in a calorimeter
Studying of first law of thermodynamics
Measurement of a heat of formation of a compound
Born-Haber cycle
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Question # 6
1 gram molecule refers to amount in grams
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Equivalent to 1 mole of an atom
Equivalent to 1 mole of a molecule
Equivalent to 1 mole of an ionic species
Of an ionic compound
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Question # 7
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 # 8
Cholestryl benzoate tums into milky liquid at
Choose an answer
140°C
145°C
148C°
149°C
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Question # 9
Which of the following alcohol cannot be produced by treatment of aldehydes or ketones with NaBH4
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I-propanol
2-Methyl-2-propanol
2-propanol
Ethanol
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Question # 10
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 # 11
Volume of O
2
gas at 0
°C is 273 cm
3
, then volume of O
2
gas at -10
°C is
Choose an answer
263 cm
3
163 cm
3
173 cm
3
73 cm
3
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Question # 12
In which one of the following does the central atom not possess an 'octet' in its outer shell?
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BH
3
CH
4
NH
3
H
2
O
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Question # 13
SiO
2
is an example of:
Choose an answer
metallic crystals
lonic crystals
a crystal whose structure depending upon the temperature
covalent crystals
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Question # 14
Which is not true in case of an ideal gas?
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It cannot be converted into a liquid
There is no interaction between the molecules
All molecules of the gas move with same speed
At a given temperature P'V is proportional to the amount of the gas
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Question # 15
Covalent bonds are least likely to be formed:
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between atoms of the same element
between atoms of different elements on the right of the periodic table
by head of the group elements with high ionization energies
between an element in Group I and an element in Group Vll
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Question # 16
Vapour pressure of a liquid
Choose an answer
increasing with increase of temperature
increases with decrease of temperature
increases with size of container
increases with volume of liquid
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Question # 17
Dehydrohalogenation of alkyl halides happens in the presence of
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Pd
Ni
Zn
KOH/alcohol
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Question # 18
Ethylene polymerizes at 100 atm pressure and 400 °C to give
Choose an answer
Polybenzene
Polypropylene
Polyalcohol
Polyethylene
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Question # 19
Aluminium is in Group lll, its oxide will have the formula.
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AlO
AlO
2
Al
2
O
3
Al
3
O
2
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Question # 20
Which of the following factors does not affect the SN1 rate is
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Nucleophilicity of the attacking nucleophile
Stability of the carbonium ion
Solvent system
The nature of leaving group
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Question # 21
Which of the following alcohols is least reactive with respect to 0-H bond
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CH3OH
CH-CH2-OH
(CH3)2-CH-OH
(CH3)3OH
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Question # 22
The strength of dipole-dipole forces depends upon
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Electro negativity difference
Distance between atoms
Electropositivity difference
Both A & B
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Question # 23
L-asparginase is helpful in treatment of
Choose an answer
skin disease
blood cancer
heart failure
obstructive jaundice
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Question # 24
When two ice cubes are pressed together they unite to form one cube. Which of the following forces is responsibles for holding them together
Choose an answer
Van der Waal's
covalent bonding
hydrogen bonding
dipole-dipole interaction
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Question # 25
The minimum temperature recorded by Kelvin scale is:
Choose an answer
273K
373K
Absolute scale is unable
0K to record this temperature
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Question # 26
An ideal gas cannot be liquefied because
Choose an answer
Its critical temperature is always above 0°C
Its molecules are relatively small in size
It solidifies before becoming a liquid
Forces operative between its molecules are negligible.
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Question # 27
Absolute zero is equal to:
Choose an answer
-273.15K
-273.15
o
C
-237.15K
-273
o
C
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Question # 28
which of the following is a typical transition metal?
Choose an answer
Sc
Y
Ra
Co
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Question # 29
Stronger the oxidizing agent, higher is
Choose an answer
Redox potential
Standard reduction potential
Reduction potential
Oxidation potemial
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Question # 30
NH
3
shows a maximum boiling point among the hydrides of V-A group elements due to :
Choose an answer
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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Question # 31
The number of moles of H2 in 0.224 L of hydrogen gas at STP (273 K, 1 atm) assuming ideal gas behaviour is
Choose an answer
1
0.1
0.01
0.001
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Question # 32
The volume of 2.8 g of carbon monoxide at 27°C and 0.821 atm pressure is (R = 0.0821 lit.atm.Mol
-1
K
-1
)
Choose an answer
30 L
3 L
0.3 L
1.5 L
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Question # 33
Dalton's law finds its application during the process of:
Choose an answer
Digestion
Respiration
Reproduction
All of above
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Question # 34
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 # 35
Which is the incorrect value of gas constant R?
Choose an answer
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 # 36
Which one of the following is not associated with SN2 mechanism
Choose an answer
100 % inversion of configuration
Tertiar alkyI halides
2nd order kinetics
Change of hy bridization from sp³ to sp² in transition state
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Question # 37
How should the conditions be changed to prevent the volume of a given gas from expanding when its mass increased?
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temperature and pressure both ara increased
temperature and pressure both are lowered
temperature is lowered and pressure is increased
temperature is increased and pressure is descreased
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Question # 38
The crystal system are of
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7 types
10 types
5 types
8 types
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Question # 39
Among the following molecules, which one has coordinate covalent (dative) bond?
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CCI4
CO2
CO
CH4
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Question # 40
Ionic solids are characterized by
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low melting points
good conductivity in solid state
high vapour pressure
solubility in polar solvents
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Question # 41
Which order of vapour pressure in the following liquids is correct
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water > ethanol > acetone > ether
ether > acetone > ethanol > water
ether > ethanol > acetone > water
water > ether > acetone > ethanol
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Question # 42
The instrument that is used to measure the pressure of a gas is called
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viscometer
photometer
barometer
stalagmometer
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Question # 43
Amorphous means
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arranged
ordered
shaped
shapeles (no arrangements)
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Question # 44
London dispersion forces are also called
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Ion-dipole forces
Dipole-induced dipole forces
Dipole-dipole forces
Instantaneous dipole induced dipole forces
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Question # 45
Solids in which atoms, ions or molecules are not regularly arranged are
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crystalline solid
amorphous solids
liquid crystals
low melting points
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Question # 46
C-H bond length in the benzene is
Choose an answer
0.99A°
1.09A°
1.12A°
1.34A°
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Question # 47
Formalin is used as:
Choose an answer
Fungicide
Germicide
Sterilizing of surgical instruments
All three
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Question # 48
Which of the following has isomorphous structure with MgO
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NaF
S
Sn
N
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Question # 49
Which of the following reactions does not involve formation of carbocation?
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SN1 and E1
El and E2
SN1 and SN2
E2 and SN2
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Question # 50
Tertiary alcohols are the easiest to dehydrate because
Choose an answer
They form stable carbocation
They have less hydrogen
They have bigger size
They are polar
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Question # 51
In graphite crystal, carbon is
Choose an answer
sp hybridized
sp
2
hybridized
sp
3
hybridized
None
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Question # 52
The polarizabilities of elements mostly increase down the group due to the reason that
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the atomic numbers increase
number of protons increase
number of shells increase along with increase of shielding effect
the behaviour of the elements remain the same
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Question # 53
The synthesis of ethene from ethyl alcohol is a reaction
Choose an answer
Dehydration
Polymerization
Addition
Substitution
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Question # 54
In a crystal the atoms are locate at the position of:
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infinite potential energy
minimum potential energy
Zero potential energy
maximum potential
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Question # 55
Diamond is a bad conductor of electricity because:
Choose an answer
it has a tight structure
it has a high density
there are no free electrons
none of the above
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Question # 56
In order to mention boiling point of water at 110∘C the external pressure should be:-
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between 760 torar an 1200 torr
between 200 torr and 760 torr
765 torr
any value of preessure
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Question # 57
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 # 58
One molecule of gas is approximately Distance______ times its own diameter from its neighbour at room temperature.
Choose an answer
30
3000
3
300
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Question # 59
If absolute temperature of a gas is doubled and the pressure is reduced to one half, the volume of the gas will:
Choose an answer
reduced to 1/4
be double
increases four times
remains unchanged
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Question # 60
Which is not mineral of AI?
Choose an answer
Diaspore
Corrundam
Bauxite
Galena
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Question # 61
Whenever a reaction is endothermic, then it means that
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Heat is transferred system to the surrounding
Heat is transferred from surrounding to the system
Heat content of the products is less than that of reactants
Heat content of the reactants is greater than the products
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