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MDCAT Chemistry Online Test MCQs With Answers
Question # 1
The number of reacting molecules whose concentration change during reaction is called
Choose an answer
Activated molecule
Rate of reaction
Order of reaction
half-life
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Question # 2
The number of molecules in one dm
3
of water is close to:
Choose an answer
6.02/22.4 x10
23
12.04/22.4 x10
23
18/22.4x 10
23
55.6x6.02x10
23
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Question # 3
The crystal of K
2
SO
4
and K
2
CrO
4
are orthorhombic. These are isomrophs due to
Choose an answer
same physical properties
their cations identical
number of O atms is equal
same shape of SO
4
-2
and CrO
4
-2
tetrahedral
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Question # 4
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 # 5
At constant volume, for a fixed number of moles of a gas the pressure of the gas increases with size of temperature due to
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increase in average molecular speed
increase in number of moles
increase in molecular attraction
decrease in the distance between the molecules
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Question # 6
Reaction of ethyl bromide with ammonia
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Completes in a single step
Completes in two steps
Continues till N is left with no lone pair
is reversible
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Question # 7
Crystals can be classified into
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7 crystal systems
4 crystal systems
3 crystal systems
14 crystal systems
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Question # 8
In nucleophilie substitution bimolecular reaction the order of reaction with respect to substrate
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2 order
3 order
1st order
Zero order
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Question # 9
The slope of the graph is steepest at the beginning of reaction showing
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Rapid decrease in concentration of reactants
Rapid increase in concentration of reactants
Fast rate of reaction
All of the above
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Question # 10
In a saturated solution of AgCl, the molar concentration of Ag+ and Cl- is 1.0x10(-5)M each. What is the value of Ksp
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1.0x10(-5)
1.0x10(-15)
0.1x10(-5)
1.0x10(-10)
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Question # 11
Which of following is oxidation state of oxygen in peroxides?
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-2
1/2
-1
+2
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Question # 12
Which one of the following is an aromatic compound?
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Benzene
Thiophene
Furan
All of them
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Question # 13
NaNO
3
and CaCO
3
crystals are Rhombohedral isomrophism is due to
Choose an answer
both soluble in water
their cations belong to S block element
same shape of NO
3
-1
and CO
3
-2
ions which is triangular planar
same number of O atoms
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Question # 14
Value of gas constant R is
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8.314 J K
-1
mol
-1
0.082 J K
-1
mol
-1
273.15 J K
-1
mol
-1
101325 J K
-1
mol
-1
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Question # 15
By the electrolysis of CuCl2 using inert electrodes of platinum which species is deposited at cathode
Choose an answer
H2
O2
Cu
CI
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Question # 16
Which of the following equation is for idea gas:
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PV = dRT
PR = nTP
PM = nRT
PV = nRT
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Question # 17
When does average rate become equal to instantaneous rate of reaction
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At the start of reaction
time interval is zero
at the end of reactior
time interval approaches zero
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Question # 18
The highest melting point is observed by
Choose an answer
Butanoic acid
Propanoic acid
Pentanoie acid
HCI
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Question # 19
The graph between P on
γ-axis and 1/V at x-axis for a given mass of a gas at temperature T is a
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straight line
curved upward
curved downward
circular
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Question # 20
According to Boyles law, at constant temperature the product of pressure and volume of a given mass of gas is
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whole number
a constant
fraction
a multiple
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Question # 21
Which thermometer will have its reading 273 degrees greater than that of thermometer C?
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A
B
B has 273 degrees greater than A
C has greater reading than all other thermometers
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Question # 22
The enthalpy change AH of a process is given by the relation
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ΔΗ =ΔΕ + P∆V
ΔH=ΔE +W
ΔH =ΔΕ-ΔnRT
ΔΕ =ΔΗ + P∆V
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Question # 23
What types of bonds are broken when water turns into steam on heating?
Choose an answer
covalent
permanent dipole interactions
hydrogen bonds
induced dipole interactions
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Question # 24
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 # 25
The distribution of energies among the molecules of gases was studied by:
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Maxwell
Coulomb
Newton
Boltzmann
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Question # 26
Which of the following gases have lowest density at room temperature
Choose an answer
CO
N
2
Ne
NH
3
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Question # 27
The curve which is obtain from Boyle's law is called as
Choose an answer
Isochoric
Isotherm
Adiabatic
All of these
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Question # 28
Which of the following is more reactive where 0-H bonds break
Choose an answer
P°alcohol
T° alcohol
S°alcohol
Cannot be predicated
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Question # 29
An example of simple protein is
Choose an answer
lipoprotein
Cholesterol
lecithin
globulin
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Question # 30
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 # 31
Styrene has empirical formula CH, and there is 92.2%C and 7.75% hydrogen. If molar mass is 104g mol¯, what will be integral multiple (n) to get molecular formula:
Choose an answer
2
4
6
8
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Question # 32
In the reaction A2 (g) + 4B2 (g) <-----------> 2AB4 (g) such that ∆H < 0, the formation of AB4(g) will be favoured at
Choose an answer
Low temperature and high pressure
Low temperature and low pressure
High temperature and low pressure
High temperature and high pressure
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Question # 33
Elements of group IA and IIA are
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electronegative
neutral
electropositive
non-metals
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Question # 34
Areal gas obeying Van der Waal's equation will resemble ideal gas ilf the:
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both a and b are large
both a and b are small
a is small and b is large
a is large and b is small
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Question # 35
For an endothermic reaction, enthalpy of reactants
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Is smaller than that of the products
Is greater than that of the products
Must be greater or smaller than that of the products
Is equal to that of the products
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Question # 36
The B.P. of compound is mostly raised by
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dipole-induced dipole interactions
london dispersion forces
intramolecular H-bonding
intermolecular H-bonding
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Question # 37
The volume of a gas that is occupied by its one mole at STP is called
Choose an answer
total volume
normal volume
molar volume
atomic volume
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Question # 38
The compound that has zero dipole moment is
Choose an answer
HCl
H
2
S
NH
3
CH
4
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Question # 39
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 # 40
Which of the following are more temperature senesitive
Choose an answer
Liquid crystals
Solid crystals
Ionic stals
None of above
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Question # 41
Which value is designated as absolute zero or zero of the Kelvin scale?
Choose an answer
-273.15
°C
-173.15
°C
273
°C
none of these
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Question # 42
Which is trigonal crystal
Choose an answer
CaSO
4
. 2H
2
O
MgSO
4
NaNO
3
All
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Question # 43
The particles in solids are
Choose an answer
widely separated and moving randomly
widely separated not moving
moving randomly but not separated
close together and vibrating slightly
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Question # 44
How temperature affects the electrical conductivity of metals?
Choose an answer
Does not change at all
Decreases with increasing temperature
Increases with increasing temperature
Decreases with decreasing temperature
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Question # 45
If a salt bridge is removed from two half cells the emf is
Choose an answer
Increased
Decreased
Dropped to zero
Electrodes will be reversed
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Question # 46
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 # 47
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 # 48
Ti+3 shows minimum absorption (maximum transmittance) at-------and-------wavelength
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Yellow, Green
Red. Yellow
Blue. Green
Red. Blue
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Question # 49
Amorphous means
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arranged
ordered
shaped
shapeles (no arrangements)
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Question # 50
If the energy of the activated complex lies close to energy of reactants, it means that reaction is
Choose an answer
Slow
Exothermic
Endothermic
Exothermic and fast
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Question # 51
Ethanol reacts with sodium metal to liberate
Choose an answer
CO2 gas
CO gas
H2 gas
Steam
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Question # 52
H
2
effuses through a porous pot at a rate of 500 cm
3
per minute at 0
°C.The rate of diffusion of O
2
through the same vessel at 0
°C per minute is
Choose an answer
500 cm
3
250 cm
3
1 dm
3
125 cm
3
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Question # 53
The system in which all the three axes are unequal and are at righ angle to each other is called
Choose an answer
cubic
hexagonal
orthorhombic
tetragonal
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Question # 54
2-propanol on oxidation yield
Choose an answer
Propionaldehyde
Propanone
Propanal
Butanal
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Question # 55
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 # 56
In which one of the following does the central atom not possess an 'octet' in its outer shell?
Choose an answer
BH
3
CH
4
NH
3
H
2
O
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Question # 57
If an endothermic reaction is allowed to take place very rapidly in air, the temperature of the surrounding air will
Choose an answer
Remains constant
Increase
Decrease
Either increase or decrease
One Joule is equivalent to
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Question # 58
Strong dipole-dipole forces among the liquid molecules are responsible for
Choose an answer
very high heat of vaporization
very low heat of vaporization
cannot be predicted
negligible forces are these
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Question # 59
Which impurity makes the shape of NaCl crystal needle like
Choose an answer
MgSO4
urea
glucose
MgCO3
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Question # 60
Which one of the following statements about positive ions is incorrect?
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they are also known as cations
they are formed when electrons are removed from atoms
they are larger than the atom from which hay were formed
they are smaller than the atom from which they were formed
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Question # 61
Boiling point of water is higher (100
°C) than that of ethanol (78.5
°C) although both have hydrogen bonding. This is because
Choose an answer
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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