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MDCAT Chemistry Online Test MCQs With Answers
Question # 1
Which is not true in case of an ideal gas?
Choose an answer
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 # 2
Tertiary alcohols have alpha bydrogens
Choose an answer
1
Zero
2
3
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Question # 3
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 # 4
In a period the atomic radii
Choose an answer
increase
decrease
remain same
first increase, then decreased
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Question # 5
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 # 6
Which property of liquid is measured by polarimeter
Choose an answer
Conductance
Optical activity
Refractiye Indéx
Change in volume
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Question # 7
Which of the following is a limitation of balanced chemical equation
Choose an answer
Conditions and rate of reactions
Physical state and mechanism
Reactants and products and their coefficients
Both (a) and (b)
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Question # 8
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 # 9
In diamond, the carbon atoms are arranged in a
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tetrahedral manner
hexagonal manner
square planar manner
octahedral manner
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Question # 10
Under which condition CO has the maximum molar volume.
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high T and P
Low T and High p
high T and low pressure
Low T and low P
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Question # 11
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 # 12
In intense electrical field and at a very high temperature matter generally exist in
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Solid state
Plasma state
Liquid state
Gaseous state
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Question # 13
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 # 14
Doubling the pressure in a liquid phase reaction
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Will double the rex
Will increase the rex
Will decrease the rex
Will not alter the concentration of reactant
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Question # 15
Born-Haber cycle is an application of
Choose an answer
Hess's law
1" law of thermodynamics
Avogadro's law
1law of thermochemistry
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Question # 16
The highest temperature in which a substance can exist as a liquid is called its
Choose an answer
Absolute temperature
Critical temperature
Maximum temperature
Body temperature
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Question # 17
For a chemical reaction which can never be a fractional no
Choose an answer
order
molecularity
half-life
rate constant
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Question # 18
A mixture of 1-chloropropane and 2-chloro-propane when treated with alcoholic KOH, gives
Choose an answer
Prop-2-ene
Isopropy lene
Propene
A mixture of prop-l-ene
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Question # 19
Dipole-induced dipole forces are also called
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dipole-dipole forces
ion-dipole forces
Debye forces
London-dispersion forces
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Question # 20
Vapour pressure of a substance does not depend upon:
Choose an answer
physical state of matter
temperature
intermolecular forces
surface area
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Question # 21
By convention, the standard heat of formation of all elements is assumed to be
Choose an answer
Zero
positive
Negative
Infinity
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Question # 22
An example of ion-dipole force is solution of
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NaCl in water
Glucose in water
Bromine in benzene
Ethanol in water
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Question # 23
what is the exact value of angle in BF3
Choose an answer
90
104.51
119.5
120°
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Question # 24
Gram atoms of hydrogen in 5.5 g H2
Choose an answer
5.50
2.25
5.45
2.20
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Question # 25
Liquefaction of gas can only be carried out if the:
Choose an answer
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 # 26
Ice floats on water because
Choose an answer
the hydrogen bonding in ice is stronger than that of in water
empty spaces are left in ice
ice has two-dimensional structure
the bond length of the oxygen and hydrogen bond is different in water and ice
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Question # 27
Crystal lattice with alternate +ve and -ve ions has radius ratio of 0.524.Its coordination number is
Choose an answer
4
3
6
12
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Question # 28
The value of the vapour pressure of water at its boiling point at Karachi and Murree is
Choose an answer
same
different
depends upon the environmental conditions in both cities
greater at Murree and less at Karachi
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Question # 29
NaCl is completely ionized in water due to presence of
Choose an answer
hydrogen bonding
dipole dipole forces
ion dipole forces
London dispersion forces
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Question # 30
Which one of the following molecules show maximum hydrogen bonding?
Choose an answer
H
2
O
H
2
Se
H
2
S
HF
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Question # 31
What forces operate between ethyl group of ethyl alcohol and oxygen of water
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H-bonding
attractive forces
repulsive forces
dipole forces
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Question # 32
Which of the following solid is amorphous
Choose an answer
NaCl
diamond
glass
MgO
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Question # 33
On the basis of intermolecular forces diamond is a
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ionic solid
covalent solid
metallic solid
molecular solid
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Question # 34
A compound z' decolorizes bromine water and produces white ppt. The compound 'z'is
Choose an answer
Alkane
Alcohol
Phenol
Benzene
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Question # 35
Hydrogen bonding is not present in which of following compound?
Choose an answer
Ammonia
Ethanol
Ether
Water
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Question # 36
The motion imparted to the gas molecules by gravity is
Choose an answer
very small
very large
negligible
appreciable
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Question # 37
Chloroform (CHCl3) is?
Choose an answer
Primary alkyl halide
Secondary alkyl halide
Tertiary alkyl halide
a liquid
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Question # 38
Which gas diffuses more rapidly?
Choose an answer
O
2
SO
3
NH
3
H
2
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Question # 39
In a given system, water and ice are in equilibrium, if the pressure is applied to the above system then
Choose an answer
Morc ice is formed
Amount of ice and water will remain the same
more ice is melted
both A and B
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Question # 40
Which pair of following pair is metalloid?
Choose an answer
Antimony and bismuth
Phosphorous and arsenic
Nitrogen and phosphorous
Arsenic and antimony
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Question # 41
Compound X & Y give effervesce with Na2CO3, solution. X gives a white ppt with ammonical AgNO3 while Y gives sweet smell compound on heating with alcohol X &Y are
Choose an answer
Formic acid & acetic acid
Acetone & formic acid
Acetaldehy de & acetic acid
Acetic acid & acetone
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Question # 42
Which of the following compound have empirical formula, but no molecular formula
Choose an answer
H20
C6H6
H
2
O
2
NaCl
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Question # 43
In a crystal a ≠ b ≠ c,a = y 90° and β ≠ 90° it is
Choose an answer
Monoclinic
Rhombic
Trigonal
Tetragonal
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Question # 44
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 # 45
What will be the pH of 1.0 mol dm -3 of H2X, which is only 50% dissociated
Choose an answer
1
0
2
Less than 0
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Question # 46
The nature of crystal of diamond is
Choose an answer
metallic
molecular
covalent
ionic
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Question # 47
What is the weight of 10 litres of CO
2
at 27
°C and 2 atm?
Choose an answer
89.3 g
36.1 g
125 g
127 g
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Question # 48
In Case of elements the polymorphism is called
Choose an answer
Isotopic form
Allotropy
Isomorphism
Crystalline forms
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Question # 49
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
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Question # 50
The order of reactivitv of alksI halides towards nucleophile is
Choose an answer
RI>RBr RF>RCI
RF>RCI>RBr>RI
RI>RBr> RCI>RE
RF>RBr>RCI>RI
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Question # 51
The boiling point of radon (211k)id higher than boiling point of helium (4.4k). This is due to the reason that:
Choose an answer
the atomic mass Rn is larger than that of He
the atomic mass Rn is larger than that of He
the dispersion forces between Rn atoms are more prominent than between he atoms
rn atomic number of Rn is larger than that of He
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Question # 52
What is name of hydrated variety of quartz?
Choose an answer
Rose quartz
Smokey quartz
Silica
Opal
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Question # 53
The exothermic process is
Choose an answer
Evaporation
Sublimation
Respiration
Boiling
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Question # 54
Keeping in view the charge density select the compound amoung the following having highest lattic energy:
Choose an answer
LiBr
KCI
MgO
NaF
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Question # 55
Which alcohol is most reactive towards sodium metal?
Choose an answer
Ter Butyl alcohol
n-Propyl alcolol
Isopropyl alcohol
Have same reactivity
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Question # 56
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 # 57
The ratio of close packed atoms to tetrahedral holes in cubic close packing is
Choose an answer
1 : 1
1 : 2
1 : 3
2 : 1
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Question # 58
The substitution of a'-H' by '-NO2' group in benzene is called
Choose an answer
Nitration
Sulphonation
Ammunolusis
Reduction of benzene
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Question # 59
Which of the following statements is not correct about galvanic cell?
Choose an answer
Anode is negatively charged
Cathode is positively charged
Reduction occurs at anode
Reduction occurs at cathode
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Question # 60
A real gas obeying van der Waals equation will resemble ideal gas if
Choose an answer
Both a and b are large
a is large and b is small
Both a and b are small
a is small and b is large
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Question # 61
Enzymes are
Choose an answer
simple proteins
derived proteins
compound proteins
conjugated proteins
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