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MDCAT Chemistry Online Test MCQs With Answers
Question # 1
A state function which describes together the internal energy and product of pressure and volume is called
Choose an answer
Enthalpy
internal energy
Work
Kinetic energy
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Question # 2
Which molecule is least ionic"
Choose an answer
NaCI
HCL
HF
CsF
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Question # 3
Naturally occurring isotopes of silver are
Choose an answer
,Two
, Four
, Forty seven
, sixteen
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Question # 4
Gases are good conductor of electricity at
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Low temperature
Low pressure
High pressure
Low temperature and high pressure
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Question # 5
Which of the following is not a postulate of the kinetic theory of gases?
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when gas particles collide, their total kinetic energy increases
gases consist of molecules in a constant state of random motion
when gas particles collide their total kinetic energy does not change at all
The gas particles travel in straight lines unit they collide with one another or with the walls of the container
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Question # 6
The maximum hydrogen bonding is in:
Choose an answer
diethyl ether
ethanol
water
benzene
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Question # 7
If V
1
= 5 litters, P
1
= 2 atm, T
1
= 273
°C, T
2
= 0
°C and V
2
= ? When P
2
= 1 atm.
Choose an answer
5 lit
10 lit
2.5 lit
12.5 lit
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Question # 8
Which one the following is not postulated in the kinetic molecular theory of gases
Choose an answer
molecules of all the gases have same size and same mass
molecules are in chaotic motion
all molecular collisions are elastic
the volume of the molecules is negligible
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Question # 9
what is it difficult to cook food at high as compared to at sea level? Choose the correct reason.
Choose an answer
H-bonding in H
2
O changes with height
temperature at the top of mountain is low
density of water decreases at the mountain
boiling point of water decreases at the mountain
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Question # 10
Carboxylic acid is more acidic than phenol because of the greater stability of
Choose an answer
Carboxylic acid
Phenoxide ion
proton
Carboxylate ion
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Question # 11
The pi-electrons in the styrene are
Choose an answer
13
10
8
6
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Question # 12
The reaction which is responsible for the production of electricity in the voltaic cell is
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Hydrolysis
Oxidation
Reduction
Redox
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Question # 13
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 # 14
Which of the substance is not going to react the sodium metal:
Choose an answer
Acetic acid
Methanol
Di methyl ether
Ethanol
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Question # 15
[Ti (H20)6]3+ ion isin colour.
Choose an answer
Yellow
Blue
Violet
Red
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Question # 16
Benzene has pi electron
Choose an answer
2
4
6
8
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Question # 17
Cyclobutane structure is categorized under
Choose an answer
Aromatic compounds
Aliphatic compounds
Alicyclic compounds
Heterocyclic compounds
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Question # 18
Which of the following substance has maximum critical temperature
Choose an answer
H
2
O
N
2
SO
2
Ne
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Question # 19
The process of effusion is best understood by law
Choose an answer
Grahams
Boyle s
Charles s
Avogadro s
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Question # 20
In solid, the temperature is the measure of:
Choose an answer
Rotational kinetic energies.
Translational kinetic energies.
Vibrational kinetic energies.
None of above.
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Question # 21
Two substances that have the same crystal structure are said to be
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isomorphous
anisotropic
isotropic
polymorphous
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Question # 22
Choose the gas law which gives relationship between volume and pressure:
Choose an answer
Bolye,s law
Graham,s law
Dalton,s law
Charles,s law
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Question # 23
The reaction between Cu and conc. H2SO4 produces
Choose an answer
Cu+2
SO
2
SO
3
H
2
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Question # 24
Amount of product formed increases with time, this statement is true for reactions-------with kinetics
Choose an answer
1s order
3rd order
zero order
Any order
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Question # 25
5604 cm3 of H2 gas at STP contains atoms of hydrogen
Choose an answer
6.02×10 (23)
2.6x10(22)
3.01x10(23)
1. 50x 10(23)
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Question # 26
Oxidation state of Mn' in KMnO4. K2MnO4, MnO2 and MnSO4 is in the order
Choose an answer
+7.+6.+2,+4
+6,+7,+2,+4
+7. +6.+4.+2
+4, +6, +7,+2
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Question # 27
Air contains 78% N
2
, 21% O
2
and 1% other gases at sea level the partial pressure of O
2
is
Choose an answer
760 torr
159 torr
592 torr
7.6 torr
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Question # 28
The oxidation state of carbon in C2O-²4 is
Choose an answer
+4
-4
+3
+2
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Question # 29
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 # 30
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 # 31
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 # 32
Choose from the followings the correct statement about Born Haber cycle
Choose an answer
Born Haber cycle is different from Hess's law
The energy changes in a cyclic process is not zero
The lattice energy of crystalline substances can be calculated easily
None
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Question # 33
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 # 34
Equal volume of all gases at same temperature and pressure contain number of molecules:
Choose an answer
multiples
equal
different
in fractions
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Question # 35
Which one of the following is more acidic
Choose an answer
Phenol
Carboxylic acid
Alcohols
Amines
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Question # 36
Coinage metals Cu. Ag, and Au are the least reactive because they have
Choose an answer
Negative reduction potential
Positive reduction potential
Negative oxidation potential
Positive oxidation potential
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Question # 37
Which of the following molecule has zero dipole moment?
Choose an answer
PCI3
BF3
NH3
H2O
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Question # 38
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 # 39
Which of the following is primary alkyl halide
Choose an answer
IsopropyI halide
Sec-butyl halide
Tert-buryi halide
Neo-pentyl halide
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Question # 40
The products of electrolysis of which of the followings are known
Choose an answer
Fused electrolyte
Aqueous solution of eleetrolyte
Solid electrolyte
Solid metal
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Question # 41
If ionic product is equal to Ksp then the solution is
Choose an answer
Unsaturatec
Ideal
Supersaturated
Saturated
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Question # 42
Aluminium is in Group lll, its oxide will have the formula.
Choose an answer
AlO
AlO
2
Al
2
O
3
Al
3
O
2
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Question # 43
Naphthalene has two fused aromatic ring of carbon atom the molecular formula
Choose an answer
C10H8
C10H14
C10H10
C12H12
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Question # 44
Consider gas is measure in bars then the units of rate of reaction is
Choose an answer
Mole dm-3 sec
Bars sec
Mole dm-3 sec-1
Bars sec-1
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Question # 45
Pressure of 1Nm
-2
is equal to
Choose an answer
One bar
1 psi
One pascal
One atmosphere
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Question # 46
The amount of heat absorbed when one mole of a liquid is changed into vapours at its boiling point is called
Choose an answer
Heat of sublimation
Heat of vaporization
Heat of fusion
Enthalpy change
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Question # 47
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 # 48
Simplest Structure of a protein that has only covalent bonding between amino acids is
Choose an answer
2° structure
3°structure
1° structure
4° structure
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Question # 49
Reactivity of carbonyl compounds is due to
Choose an answer
Electrophilic carbon
Less stearic hindrance
Unsaturation of Co
Polarity of bond
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Question # 50
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 # 51
Elements having high ionization potential values are
Choose an answer
metals
non- metal
liquids
solid
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Question # 52
Hardness of diamond is attributed to the
Choose an answer
strength of the ionic bonds in the structure
three-dimensional network of covalent bonds
three-dimensional network of covalent bonds
absence of valence electrons in carbon atoms
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Question # 53
If volume of an ideal gas at 0C° 536cm3, what is volume at 1°C
Choose an answer
373 cm3
646 cm3
Becomes 0cm3
746 cm3
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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
Equal volume of all gases at same temperature and pressure contain number of molecules
Choose an answer
different
multiples
equal
in fractions
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Question # 56
In nucleophilie substitution bimolecular reaction the order of reaction with respect to substrate
Choose an answer
2 order
3 order
1st order
Zero order
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Question # 57
Which of the following is electrophile for alkylation?
Choose an answer
NO+2
SO3
R+
Both a & b
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Question # 58
NaCI has face centered cubic structure. The Na ion at the face of the unit cell is shared by
Choose an answer
2-unit cells
4-units cells
only one unit cell
8-unit cells
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Question # 59
Which of the following is not the application of plasma
Choose an answer
Fluorescent light bulb
Removal of hazardous chemical
Neon signs
Corrosion effective
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Question # 60
In which of the following Equilibria will Kc and Kp have not the same value
Choose an answer
2HI <--------> H2+I2
2SO2 + O2 <--------> 2SO3
N2 + O2 <---------> 2NO
All of these
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Question # 61
Dehydrogenase is an erample of
Choose an answer
Transferase
Hydrolase
Lyase
Oxido-reductase
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