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MDCAT Chemistry Online Test MCQs With Answers
Question # 1
S.I units for measurements of pressure
Choose an answer
Pascal
mm of Hg
atm
Torr
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Question # 2
ln ethyl alcohol, the bond that undergoes heterolytic cleavage most readily is
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C-C
C-O
C-H
O-H
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Question # 3
When vapour pressure is equal to atmospheric pressure than it is called
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Evaporation
M.P
B.P
Freezing point
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Question # 4
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 # 5
The pressure of gas at constant temperature in a container of 2dm3 is 10 atm what will be its final pressure if it is connected with 10 dm3 container
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2 atm
1.6 atm
5 atm
I atm
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Question # 6
The molecules of CO2, in dry ice form the
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covalent crystals
molecular crystals
none of these crystals
ionic crystals
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Question # 7
The nature of crystal of diamond is
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metallic
molecular
covalent
ionic
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Question # 8
Helium atom is two times heavier than a hydrogen molecule. At 298 K, the average kinetic energy of a helium atom is
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same as that of a hydrogen molecule
half that of a hydrogen molecule
two times that of a hydrogen molecule
four times that of hydrogen molecule
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Question # 9
The volume of a real gas
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is constant
increases with T decrease
becomes zero at absolute zero
never becomes zero
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Question # 10
One Joule is equivalent to
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4.184 cal.
0.4184cal.
1/2 cal.
1/4.184 cal
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Question # 11
Which of the following govern the diffusion of gases
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Dalton's law
Avogadro's law
Graham's law
Newton's law
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Question # 12
The element which exhibits maximum catenation property is
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C
Pb
Ge
Sn
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Question # 13
Final product of hydrolysis of nitrile is
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Ketone
Alcohol
Aldehyde
Carboxylic acid
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Question # 14
Which of the follwing dnes not give brick red precispitate wits Fehling's solution
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Acetaldehyde
Formalin
prorionaldehyde
Acetone
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Question # 15
The instrument that is used to measure the pressure of a gas is called
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viscometer
photometer
barometer
stalagmometer
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Question # 16
250cm of 0.2 molar potassium sulphate solution is mixed with 250cm of 0.2 molar KCI solution. The molar concentration of K ions is:
Choose an answer
0.2 molar
0.25 molar
0.3 molar
0.35 molar
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Question # 17
Mathematically, Boyle's law is indicated as:
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VT = K
PT = K
PV = K
None of these
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Question # 18
Which of the following statement about graphite is not true?
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The coordination number of carbon atoms is 4.
the carbon atoms are arranged layers.
the layers in graphite are attracted to each other weak forces.
the corbon atoms use only three of their four outer electrons for covalent bonding.
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Question # 19
The carbon atom of an alkyl group attached with halogen atom is called
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Electrophile
Free redical
Nucleophile
Nucleophilic centre
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Question # 20
Which of the following is soluble in water?
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СН3ОН
CCL4
CHCI3
CS2
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Question # 21
ΔH° represent the enthalpy change at
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0°C and 1 atm pressure
25°Cand 1atm
0K and I atm pressure
25°C and 2 atm pressure
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Question # 22
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 # 23
Which of the following may be called London dispersion forces
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dipole-dipole forces
ion-dipole forces
dipole-induced dipole forces
instantaneous dipole-induced dipole forces
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Question # 24
An alcohol is converted to an aldehyde with same number of carbon atoms as that of alcohol in the presence of K2Cr2O7/H2S04 the alcohol is
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CH3C(CH3)2OH
(CH3)3COH
CН3СН2СН2OH
(CH3)2CHOH
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Question # 25
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 # 26
Number of H+ ions when 0.1 mole of sulfuric acid is completely ionized in water
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4x6.022x10ê23
1×6.022x10ê23
2x6.022 x10ê23
2x6.022x10ê22
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Question # 27
The value of Kc for H2O at 25C° is
Choose an answer
1x10 (-14)mole dm-3
14 mol dm-3
1.86×10(-16) mol dm-3
1.0x10 (-7)moldm-3
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Question # 28
State of hybridization of carbon in the carbocation is
Choose an answer
sp3
sp
sp2
dsp2
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Question # 29
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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Question # 30
Intermolecular forces exist between molecules of group 7 elements which of the following sequence represents the strength of the intermolecular forces?
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Cl
2
> Br
2
> I
2
Br
2
> Cl
2
> I
2
Cl
2
> Br
2
> I
2
I
2
> Br
2
> Cl
2
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Question # 31
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 # 32
Which class of compound cannot show positional isomerism?
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Alkanes
Alkene
Alkynes
Alcohol
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Question # 33
At freezing point of water, the density decreases due to
Choose an answer
change of bond angles
change of bond lengths
cubic structure of ice
empty spaces present in the structure of ice
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Question # 34
How magnesium reacts with water?
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In frozen ice water
With cold water
In with steam
In hot state
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Question # 35
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 # 36
One of the following is a ionic solid. Which is that?
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Fe
KBr
Diamond
Cr
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Question # 37
Bond will be covalent when electronegativity difference of bonded atom is
Choose an answer
Equal to 1.7
between 0.5 to l.7
Greater to 1.7
zero
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Question # 38
The relationship between volume of a given amount of gas and prevailing conditions of temperature and pressure are:
Choose an answer
Charle's law
Graham's law
Boyle's law
Gas laws
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Question # 39
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
Choose an answer
1.0x10(-5)
1.0x10(-15)
0.1x10(-5)
1.0x10(-10)
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Question # 40
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 # 41
Oxygen molecule is 16 times heavier than:
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Helium
Hydrogen
Neon
Aluminium
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Question # 42
Which reagent is responsible for the conversion of ketone to secondar alcohul
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NaAlH
NaBH4
Al
Red P
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