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MDCAT Chemistry Online Test MCQs With Answers
Question # 1
The best concentration unit used for K⁺ ions present in potable water is
Choose an answer
ppm
Mole fraction
Molarity
Molality
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Question # 2
In order to determine ∆H (latt) of ionic compound which is correct relationship
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∆H latt. = ∆Hf - ∆Hx
∆H latt. = ∆Ha + ∆Hv
∆H latt. = ∆Hf + ∆Hx
∆H latt. = ∆Hf - ∆H sol.
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Question # 3
The number of atoms or molecules whose concentrations determines the rate of a chemical reaction is called the
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Molecularity of the reaction
specific activity of the reaction
Order of the reaction
rate constant of the reaction
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Question # 4
One kilo calorie is equal to
Choose an answer
4.184J
1000J
4184J
1kJ
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Question # 5
In the reaction A+B→ Products, if B is taken in excess, then it is an example of
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Second order reaction
zero order reaction
Pseudo first order reaction
first order reaction
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Question # 6
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 # 7
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 # 8
CH3CH2CH2OH--------A---------B Here B is
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Propyne
Propanal
Propene
Propane
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Question # 9
A gas has non-ideal behaviour at:
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high temperature and high pressure
low temperature and low pressure
high temperature and low pressure
low temperature and low pressure
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Question # 10
The strongest conjugate base is
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OH-
CH3O-
C6H5O-
CH3COO-
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Question # 11
An example of ion-dipole force is the solution of:
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bromine inbenzene
ethanol is water
NaCl in water
glucose in water
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Question # 12
S.I units for measurements of pressure
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Pascal
mm of Hg
atm
Torr
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Question # 13
Joule is a unit of energy which is defied as
Choose an answer
Kgm
-2
s
-2
Kgm
2
s
-1
Kgms
-2
Kgm
2
s
-2
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Question # 14
C-H bond length in the benzene is
Choose an answer
0.99A°
1.09A°
1.12A°
1.34A°
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Question # 15
In order to mention boiling point of water at 110∘C the external pressure should be:-
Choose an answer
between 760 torar an 1200 torr
between 200 torr and 760 torr
765 torr
any value of preessure
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Question # 16
If increase in temperature and volume of an ideal gas is two times, then the initial pressure P changes to
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4P
P
2P
3P
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Question # 17
The volume of a gas that is occupied by its one mole at S.T.P. is known as:
Choose an answer
atomic volume
molar volume
normal volume
total volume
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Question # 18
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 # 19
Which reactant does hnof liberate water on reaction with alcohol
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NH3
K2Cr2O7/15H2O
HCI
PCI3
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Question # 20
Moles of protons in 20g of SO3
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10
20
40
80
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Question # 21
What is correct about heat of combustion
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It is applicable to gaseous substances only
It is always negative
It is always positive
It is positive in some cases while negative in other
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Question # 22
If absolute temperature of a gas is doubled and pressure is reduced to one half, then the volume of the gas will
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remains unchanged
increases unchanged
reduces to 1/4
increases 4 times
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Question # 23
2,5-dimethyl-1-hexene has
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Two sp2 hybridized carbons
Six sp2 hybrid carbons
Two double bonds
Four pi electrons
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Question # 24
Identify the compound, which give iodoform test
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Methanol
3- Hexanol
Methyl ketone
Propionaldehyde
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Question # 25
Benzene in the presence of AICl3 produces acetophenone when reacts with
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AcetyI chloride
EthyI benzene
Acetic acid
Ethanoic acic
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Question # 26
In elimination reaction i.e, in the formation of alkene, the reactivity of alkyl halide is in the order:
Choose an answer
CI>Br>I
I>Br>Cl
Br>CI>I
I>CI> Br
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Question # 27
Number of H+ ions when 0.1 mole of sulfuric acid is completely ionized in water
Choose an answer
4x6.022x10ê23
1×6.022x10ê23
2x6.022 x10ê23
2x6.022x10ê22
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Question # 28
The motion imparted to the gas molecules by gravity is
Choose an answer
very small
very large
negligible
appreciable
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Question # 29
Smell of cooking gas during leakage from gas cylinder is detected because of the property of:
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Effusion
Evapotration
Diffusion
Conduction
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Question # 30
Which of the following solids has a simple molecular lattice?
Choose an answer
magnesium oxide
sodium
silicon(IV) oxide
sulphur
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Question # 31
Soda lime is often employed to remove both
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H2O and NO2
CO2, and NO2,
H2O and CO2
H2S and CO2
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Question # 32
Which of the following statements is false?
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Avogadro number = 6.02 x 10
21
The relationship between average velocity (v) and root mean square velocity (u) is v = 0.9213 u
The mean kinetic energy of an ideal gas is independent of the pressure of the gas
The root mean square velocity of the gas can be calculated by the formula (3RT/M)
1/2
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Question # 33
The compressibility factor of an ideal gas is
Choose an answer
0
1
2
4
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Question # 34
When graph is plot between P and 1/V at constant temperature. A straight line obtains which move toward ______ when temperature increase
Choose an answer
Pressure axis
Volume axis
1/V axis
1/P axis
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Question # 35
The ionization energy of hydrogen atom is
Choose an answer
Zero
131.3kJmole
13.13kJ/mole
1313kJ/mole
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Question # 36
Which statement explains why the boiling point of methane is higher than that of neon?
[A
r
:H.1:c,12:Ne,20]
Choose an answer
A molecule of methane has a greater mass than a molecule of neon
Molecules of methane form hydrogen bonds but those of neon do not
Molecule of methane have strongel intermolecular forces than those of neon
The molecule of methane is polar, but that of neon is not
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Question # 37
Which of the following compound is least reactive
Choose an answer
HCHO
CH3CHO
CH3COCH3
C6H5CHO
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Question # 38
The critical temperature of CO
2
______°C at 73 atm critical pressure
Choose an answer
21.142
28.892
31.142
35.452
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Question # 39
Ionic crystals are brittle because
Choose an answer
they have cubic geometry
they are bad conductors of electricity
coordination number of cations and anions is same
cations and anions are arranged in alternate positions in layers
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Question # 40
Which compound is not formed as a result of reaction between acetic acid & HI & red phosphorous
Choose an answer
Ethanol
Water
lodine
Ethane
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Question # 41
Which of the following reactants will be required to form ethene from ethyl chloride
Choose an answer
Alcoholic KOH
Alkaline KMnO4
Aqucous KOH
Aqucous NaOH
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Question # 42
Which pair of molecules have debye force
Choose an answer
Ne and Ne
Argon and water
Na
+
ion and water
Water and water
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Question # 43
During esterifcation, the alcobol molecule acts as:
Choose an answer
Oxidizing agent
Electrophile
Reducing agent
Nucleophile
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Question # 44
An ideal gas expands according to PV=constant. On expansion, the temperature of gas
Choose an answer
will rise
will drop
cannot be determined because the exteral pressure is not known
will remain same
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Question # 45
The kinetic theory of gases predicts that total kinetic energy of a gaseous assembly depends on
Choose an answer
Pressure of the gas
Temperature of the gas
Volume of the gas
Pressure,temperature,and volume of the gas.
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Question # 46
The ideal gas law holds best under the conditions of
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high pressure and high temperature
low pressure and high temperature
low pressure and low temperature
high pressure and low temperature
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Question # 47
A basic buffer solution can be prepared by mixing?
Choose an answer
Weak acid and its salt with strong base
Weak base and its salt with strong acid
Strong acid and its salt with weak base
Strong base and its salt with strong acid
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Question # 48
In Boyle's law which of the following pair is variable:
Choose an answer
Temperature and quantity of a gas.
Pressure and volume.
Volume and quantity of a gas.
Pressure and quantity of a gas.
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Question # 49
The highest temperature at which gas can be liquefied and above which liquefaction is impossible is called
Choose an answer
Boiling temperature
Upper consulate temperature
Transition temperature
Critical temperature
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Question # 50
Carboxylic acids reacts with sodium carbonate, & gas evolved in this reaction
Choose an answer
CO2
H2
CO
Both a &b
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Question # 51
In the presence of hot alkaline potassium permanganate solution 2-butene will give
Choose an answer
Formic acid +acetic acid
Two moles ethanoic acid
Two moles of methanoic acid
Ethylene glycol
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Question # 52
The nature of crystals formed due to London forces of interaction are
Choose an answer
molecular
metallic
ionic
covalent
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Question # 53
Geometry of NH3 is
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Tetrahedral
Square planer
Pyramidal
Linear
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Question # 54
Which is most acidic?
Choose an answer
H2O
C2H5OH
C4H9OH
CH3-CH2-CH2OH
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Question # 55
The alkaline hydrolysis of bromoethane shown below gives alcohol as the product: H3C-CH2-Br-------H3C-CH2-OH
The reagent and the condition used in this reaction may be:
Choose an answer
H20 at room temperature
KOH in alcohol
Ethanol. heat
Dilute NaOH(aq) warm
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Question # 56
According to kinetic molecular theory, kinetic energy of molecules increases when they are:
Choose an answer
melted from solid to liquid state
frozen into a solid
condensed into liquid
mixed with other molecular at low temperature
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Question # 57
Haemoglobin molecule is how many times heavier than helium atom
Choose an answer
68000 times
17000 times
,34000 times
, 1700 times
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Question # 58
Which one of the following is not a form of chemical bonding?
Choose an answer
covalent bonding
hydrogen bonding
ionic bonding
metallic bonding
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Question # 59
Rate of which reaction increases with temperature?
Choose an answer
Exothermic and endothermic reactions
Endothermic reactions
Exothermic reactions
None of these
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Question # 60
In all oxidation reactions, atoms of an element in a chemical species lose electrons and increases their
Choose an answer
Oxidation states
Reduction states
Electrode
Negative charges
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Question # 61
How many electrons have to be removed to ionize 1.0 x 10(-6) moles of Ne atoms to Ne+ ions in a neon advertising tube:
Choose an answer
6.02x10ê23/1.0x10ê-6
1.0x 10ê-6 x 6.02x 10ê23
1.0x10ê-6 x 6.02×10ê23/20.2
1.0x10ê-6 x 6.02x10ê23/9.65x10ê-1
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