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MDCAT Chemistry Online Test MCQs With Answers
Question # 1
The compound used to distinguish the ethyne and ethene is
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Alkaline KMnO4
Ammonical AgNO3
Bromine water
Tollen's Reagent
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Question # 2
Liquids evaporate at every temperature. When the temperature becomes constant for a liquid, then:
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rate of evaporation is greater than the rate of condensation
the rate of condensation is greater than the rate of evaporation
The rate of condensation and evaporation become equal
it depends upon the nature of the liquid
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Question # 3
Which of the following statement about the order of reaction is true?
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The order of reaction can only be determined by experiment
a second order reaction is also bimolecular
The order of reaction is always non-zero
The order of reaction increases with increasing temperature
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Question # 4
Name the compound, which shows geometric isomerism
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I-bromo-2-chloropropene
2.3-dimethy lpropene
2-pentene
Both A & B
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Question # 5
The enzyme which is found in saliva, accelerates the conversion of starch into sugar is
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Pepsin
Thrombin
Ptyalin
Fumarase
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Question # 6
The electrochemical series is based on
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pH scale
Redox scale
Hdrogen scale
Arrhenius scale
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Question # 7
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
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Formic acid & acetic acid
Acetone & formic acid
Acetaldehy de & acetic acid
Acetic acid & acetone
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Question # 8
The solubility of Fe(OH)3 is 'x' mole per dm3. Its Ksp would be
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9X3
3X4
27X4
9X4
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Question # 9
pi-bond can be formed by sideways overlap of
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s-orbital
d-orbital
p-orbital
sp orbital
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Question # 10
Decomposition of H2O is
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Endothermic reaction
Nuclear reaction
Exothermic reaction
Zero nuclear reaction
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Question # 11
The sun is a ball of plasma heated by nuclear fusion is
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1.0 million km
2.0 million km
1.5 million km
2.5 million km
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Question # 12
A covalent bond may be
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100% covalent
Partial ionic
100% ionic
Both a and b
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Question # 13
Someone is saying that glass must be a super cooled liquid. The reason that he might have in his mind is that glass has :
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definite shape
definite-volume
crystalline structure
no crystalline structure
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Question # 14
Boiling point of water is higher (100
°C) than that of ethanol (78.5
°C) although both have hydrogen bonding. This is because
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water molecules are closely packed
water is more acidic than ethanol
ethanol is an organic liquid
number of hydrogen bonds are more in H
2
O
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Question # 15
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 # 16
At constant pressure, if the original volume is 546 cm
3
at which temperature the volume of gas 552 cm
3
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1°C
2°C
3°C
4°C
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Question # 17
Cl
2
is a gas while iodine is a solid due to
Choose an answer
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 # 18
Acetone and chloroform are soluble in each other due to:
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intermolecular hydrogen bonding
dipole-dipole interaction
instantaneous dipoles
all of the above
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Question # 19
Which is most acidic?
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H2O
C2H5OH
C4H9OH
CH3-CH2-CH2OH
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Question # 20
Which of the following contains maximum of number of molecules?
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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 # 21
Which of the following metal oxides is antiferromanetic in nature?
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MnO
2
TiO
2
NO
2
CrO
2
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Question # 22
Most of the reactions which give stable products are
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Endothermic
Exothermic
Isothermal
Non of these
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Question # 23
The actual volume of gas molecules is considered negligible at following pressures
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2atm
4atm
6 atm
8 atm
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Question # 24
The alcohol that does not form curbonyl compound on oxidation
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iso-butyl alcohol
neo pentyl alcohol
Ethanol
ter-butyl alcohol
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Question # 25
Which of the following salts would give the same products irrespective of whether its molten form or concentrated aqueous solution is electrolysed?
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Magnesium bromide
Magnesium sulphate
Copper sulphate
Copper chloride
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Question # 26
Zinc reacts with dilute acids to liberate hydrogen. This is because:
Choose an answer
Zn2+ ion is a powertul osidising agent than H' ion
H+ ion is a powerful oxidising agent than Zn ion
Zn2+ ion is a powerful reducing agent than H' ion
H+' ion is a powerful reducing agent than Zn- ian
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Question # 27
Diamond is a bad conductor of electricity because:
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it has a tight structure
it has a high density
there are no free electrons
none of the above
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Question # 28
Which compounds is alicyclic in nature?
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Cyclobutane
Iso-bstand
n-Butane
Toluend
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Question # 29
The boiling point of radon (211 K) is higher than boiling point of Helium (4.4 K) because
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the atomic number of Rn is larger than that of the He
the atomic mass of Rn is larger than that of He
the dispersion forces between Rn atoms are more prominent that between He atoms
Rn atoms are joined by dipole-dipole force whereas He atoms are joined by hydrogen bonding
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Question # 30
According to the general gas equation, density of an ideal gas depends upon
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Pressure
Temperature
Molar mass of the gas
All of the above
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Question # 31
Lind's ,method for liquefaction of gases is based on the principle of:
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Graham's law of diffusion
Joule Thomson effect
Avogadro's hypothesis
Dalton's law of partial pressure
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Question # 32
The bonding which occurs among polar covalent molecules containing H and one of the small electronegative element such as O, F or N is called
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bridge bonding
metallic bonding
hydrogen bonding
Ionic bonding
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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
The total pressure exerted by a mixture of gases is the sum of the partial pressure of all the gases present is a statement of
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Charle's Law
Boyle's Law
Dalton's Law
Graham's Law
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Question # 35
What is the mass of 10
20
molecules of CO
2
at STP?
Choose an answer
7.3 x 10
-3
g
7.9 x 10
-3
g
3.2 x 10
-3
g
4.9 x 10
-3
g
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Question # 36
If Kc value is small then equilibrium position will shift
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Towards left
Remains unchanged
Towards right
lt is always constant value
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Question # 37
Some of crystals are good conductors of heat and electricity, they may be
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ionic in nature
of metallic character
covalent in nature
of molecular nature
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Question # 38
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 # 39
Amorphous solids
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have sharp melting points
undergo clean cleavage when cut with knife
have perfect arrangement of atoms
can possesses small regions of orderly arrangements of atoms
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Question # 40
One of the following is a ionic solid. Which is that?
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Fe
KBr
Diamond
Cr
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Question # 41
If a gas expands at constant temperature
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The pressure decreases
The Kinetic energy of the molecules remains the same
The kinetic energy of the molecules decreases
The number of molecules of the gas increase
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Question # 42
In s solution 7.8 g of benzene ( C6H6 ) and 46g of toluene (C6H5CH3) is present. The mole fraction of toluene is
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1/3
1/5
2/3
5/6
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Question # 43
NH
3
shows maximum boiling among the hydrides of group V elements. The is due to:
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pyramidal structure of NH
3
H-bonding between its molecules
enhanced electronegative character
very small size of nitrogen
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Question # 44
The relative rates of diffusion of a gas (Mol.wt.=98) as compared to hydrogen will be
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1/7
1/5
1/4
1
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Question # 45
NaCI has face centered cubic structure. The Na ion at the face of the unit cell is shared by
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2-unit cells
4-units cells
only one unit cell
8-unit cells
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Question # 46
The electrolyte used in fuel cell is
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КOH
NaCl(aq)
NaNO3
Molten NaCl
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Question # 47
If a = b = c and x = y = z 90
° then crystal structure is
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Cubic
Tetragonal
Orthorhombic
Triclinic
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Question # 48
Coinage metals Cu. Ag, and Au are the least reactive because they have
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Negative reduction potential
Positive reduction potential
Negative oxidation potential
Positive oxidation potential
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Question # 49
The destiny of a gas is directly proportional to pressure, inversely proportional to temperature and directly proportional to:
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Viscosity
Molar mass
Momentum
All of above
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Question # 50
The boiling point of radon (211k)id higher than boiling point of helium (4.4k). This is due to the reason that:
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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 # 51
1 gram formula refers to
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Amount in grams equivalent to 1 mole of a atom
Amount in grams equivalent to 1 mole of a covalent compound
Amount in grams equivalent to 1 mole of a ionic compound
Amount in grams equivalent to 1 mole of an ion
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Question # 52
Third order of protein structure refers to
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Bending of protein chain
Three-dimensional structure of protein
Number and sequence of amino acids
Site of disulphide bonds
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Question # 53
Oxidation state of Mn' in KMnO4. K2MnO4, MnO2 and MnSO4 is in the order
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+7.+6.+2,+4
+6,+7,+2,+4
+7. +6.+4.+2
+4, +6, +7,+2
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Question # 54
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 # 55
Equal masses of methane and oxygen are mixed in an empty container at 25∘C.
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1/3
8/9
1/9
16/17
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Question # 56
Equal volumes of ideal gases contain equal number of molecules at:
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Same temperature
Same pressure
Same environmental conditions
Both (A) and (B)
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Question # 57
The rate of diffusion of a gas is:
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Inversely proportional to its density.
Inversely proportional to square root of its molecules mass.
Directly proportional to molecular mass.
Directly proportional to its density.
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Question # 58
Which of the elements has seven electrons in d-subshell?
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Zn
Co
Cu
Fe
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Question # 59
The examples of a hexagonal system is
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sugar
graphite(a=b not equal to c) {Alpha =beta. not equal to gamma}
sulphur
diamond
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Question # 60
Amount of heat absorbed when one mole of a solid melts into liquid form at its melting point is called:
Choose an answer
heat of vaporization
latent heat of fusion
molar heat of fusion
molar heat of sublimation
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Question # 61
Which of the following pairs of not form a dative covalent bond to each other?
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NH
3
and H
+
H
2
O and H
+
NH
3
and BF
3
CH
4
and AICI
3
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