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MDCAT Chemistry Online Test MCQs With Answers
Question # 1
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 # 2
Freshly cut metals have a shining surface because
Choose an answer
electrons excited, then excited electrons release energy as light
metals have brittle nature
metals conductivity increases
metals are malleable and ductile
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Question # 3
If pressure is increased from a 2 atm to 4 atm on a gas then its volume will decrease from:
Choose an answer
3L to 1L
4L to 2L
6L to 4L
8L to 2L
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Question # 4
A crystal system in which all three angles and all three edges are different is called
Choose an answer
triclinic
rhombohedral
cubic
hexagonal
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Question # 5
Which group activates the benzene ring
Choose an answer
-COOH
-COR
-CHO
-OH
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Question # 6
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 # 7
Zine does not show variable oxidation state, because
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Its d-subshell is incomplete
Its d-subshell is complete
It is relatively soft metal
It has two electrons in outermost shell
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Question # 8
Glucose and fructose are isomers
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Chain isomers
Position isomers
Functional group isomers
Metamers
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Question # 9
Acetaldchyde and ketone form addition product with
Choose an answer
Phenyl hydrazine
Hydroxylamine
Hydrazine
hydrogen cyanide
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Question # 10
Elements of group IV-A are
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neither strongly electropositive nor strongly electronegative
strongly electropositive
strongly electronegative
none of these
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Question # 11
The hetero atom in py ridine is
Choose an answer
Oxygen
Nitrogen
Chlorine
Sulphur
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Question # 12
If 1 mole of an ideal gas is heated from 273.15 K to 283.15 K at 1 atmospheric pressure, then increase in its energy is
Choose an answer
0.082 atm.dm
3
0.821 atm.dm
3
8.21 atm.dm
3
40.6 kJ
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Question # 13
The intramolecular forces in gases are:
Choose an answer
Weak.
Normal.
Very weak.
Strong.
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Question # 14
The compound that has zero dipole moment is
Choose an answer
HCl
H
2
S
NH
3
CH
4
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Question # 15
During sudden expansion of a gas energy is needed to overcome the intermolecular:
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Vibrations
Attractions
Repulsions
All of above
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Question # 16
When 2-bromobutane reacts with alcoholic KOH, the reaction is called
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Chlorination
Halogenation
Dehydrohalogenation
Hydrogenation
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Question # 17
Which of the statement is applicable for both ideal and real gases molecules?
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Have no forces of attraction
Collisions between the molecules is elastic
Molecules are in random movement
The actual volume of gas is negligible as compared to the volume of gas
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Question # 18
The Sl mechanism for the hydrolysis of an alkyl halide to an alcohol involves the formation of
Choose an answer
Carbocation
Carbanion
Pentavalent carbon in the transition state
Free radical
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Question # 19
The original volume of a gas at 0
° is 273 cm
3
at constant pressure, its volume at 273
°C becomes
Choose an answer
zero cm
3
546 cm
3
446 cm
3
346 cm
3
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Question # 20
In an elimination reaction a more substituted alkene is formed due to the stability associated with
Choose an answer
Free radical
transition state
Activated complex
Carbocation
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Question # 21
When a compressed gas is allowed to expand into a region of low pressure, it produce:
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Vapours
Cooling effect
Heating effect
None of above
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Question # 22
The shielding effect of inner electron is responsible for
Choose an answer
Having no effect on ionization energy
Decreasing ionization energy
Increasing ionization energy
Increasing electronegativity
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Question # 23
Which of the following molecules have a permanent dipole
Choose an answer
CH
4
CHCl
3
CCl
4
CO
2
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Question # 24
Combustion analysis is performed for the determination of
Choose an answer
Molar mass of the compound
Empirical formula of the compound
Structural formula of the substance
Mass of halogens present in organic compounds
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Question # 25
In which molecule. all atoms are coplanar?
Choose an answer
CH4
BF3
NH3
PH3
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Question # 26
As the number of carbon atoms increases the number of isomers also increase. The 5 C compound pentane has as many as
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3 isomers
5 isomers
6 isomers
10 isomers
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Question # 27
Molar mass of formic acid in benzene comes out to be
Choose an answer
64
46
32
92
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Question # 28
Which Henderson equation is not correct?
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pH= pKa +log [ salt/acid]
pH = pKa - log [ salt/acid ]
pH= pKa - log[ acid/salt ]
Pka = pH - log [ salt/acid ]
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Question # 29
When the concentration of reactants is taken as unity the rate of reaction is equal to
Choose an answer
average rate
concentratian of reactant
instantaneous rate
specific rate constant
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Question # 30
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 # 31
There is more deviation in the behaviour of a gas from the ideal gas equation PV = nRT
Choose an answer
At high temperature and low pressure
At low temperature and high pressure
At high temperature and high pressure
At low temperature and low pressure
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Question # 32
The protein component of enzyme ls called
Choose an answer
apoenzyme
proenzyme
holoenyme
co-enzyme
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Question # 33
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 # 34
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 # 35
In which of the following molecules strongest hydrogen bond is shown
Choose an answer
water
ammonia
hydrogen fluoride
hydrogen sulphide
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Question # 36
The synthesis of ethene from ethyl alcohol is a reaction
Choose an answer
Dehydration
Polymerization
Addition
Substitution
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Question # 37
The deviation of a gas from ideal behavior is maximum at:
Choose an answer
-10∘C and 5.0 atm
-10∘C and 2.0 atm
100∘C and 2.0 atm
0∘C and 2.0 atm
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Question # 38
In an electrochemical series, elements are arranged on the basis of
Choose an answer
pH scale
pKa scale
pOH scale
Hydrogen scale
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Question # 39
The radioactive disintegration of 238U92 is
Choose an answer
First order
Second order
Third order
Zero order
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Question # 40
Which of the following best describes the shape and polarity of the carbon disulphide molecule?
Choose an answer
Bent and polar
Linear and non-polar
Pyramidal and polar
Bent and non-polar
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Question # 41
Reaction of alcohol with hydrogen chloride, in the presence of Zinc chloride yields
Choose an answer
Ketone
Carboxylic
Alkyl halide
Ester
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Question # 42
Relative acidic strength of alcohol, phenol, water and carboxylie acid is
Choose an answer
Carboxylic acid > Alcohol > Phenol > Water
Carboxylic acid > Phenol > Water> Alcohol
Water > Alcohol> Phenol > Carboxylic acid
Phenol > Carboxylic acid > Alcohol> Water
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Question # 43
The rate of reaction between A and B increases by a factor of 100, when the concentration of A is increased 10 folds, the order of reaction with respect to A is
Choose an answer
10
1
4
2
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Question # 44
The addition compound obtained by reacting acetaldelyde and HCN, when Iydrolyzed gives
Choose an answer
Ethyl alcohol
Methyl cyanide
2-Hydroxy propanoic acid
Ethyl cyanide
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Question # 45
Volume of O
2
gas at 0
°C is 273 cm
3
, then volume of O
2
gas at -10
°C is
Choose an answer
263 cm
3
163 cm
3
173 cm
3
73 cm
3
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Question # 46
Which one of the following is not an alicyclic compound?
Choose an answer
Cyclohexene
Cyclohexane
Benzene
Cyclopentane
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Question # 47
A certain buffer solution contains equal cone. of X- and HX. Ka for HX is 10(-8). The pH of buffer is
Choose an answer
3
11
8
14
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Question # 48
Ethene can give all of the following reactions except
Choose an answer
Addition
Free radical substitution
Hydrohalogenation
Hydration
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Question # 49
Fe+2 is the co-factor for
Choose an answer
Chrome oxidase
Glucose-6-phosphatase
Carbonic anhydrase
Hydrolase
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Question # 50
What is the pressure of 2 mole of NH
3
at 27°C when its volume is 5 lit.in Van der Waals equation?(a = 0,17,b = 0.03711)
Choose an answer
10.33 atm
9.333 atm
9.74 atm
9.2 atm
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Question # 51
The average kinetic energy of an ideal gas per molecule is SI units at 25°C will be
Choose an answer
6.17 x 10
-21
KJ
6.17 x 10
-21
J
6.17 x 10
-20
J
7.16 x 10
-20
J
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Question # 52
According to Boyle's law at constant temperature, the product of pressure and volume of a given mass of gas is:
Choose an answer
a constant
fraction
whole number
a multiple
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Question # 53
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 # 54
The rate of diffusion of a gas is:
Choose an answer
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 # 55
Enthalpy of a system can be calculated by which of following relationship
Choose an answer
q=ΔΕ
q=m×S×∆T
q=pv
q=m×v×∆T
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Question # 56
Enthalpy of neutralization of strong acids and strong bases have same values because
Choose an answer
Neutralization leads to the formation of salt and water
Acids always give rise to H+ and bases always furnish OH-
Strong acids and bases are ionic substances
The net change involves the combination of H and OH ions to form water
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Question # 57
At ordinary temperature, the most nearly ideal gases are
Choose an answer
N
2
He
H
2
all these
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Question # 58
The strength of dipole-dipole forces depends upon
Choose an answer
Electro negativity difference
Distance between atoms
Electropositivity difference
Both A & B
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Question # 59
The structure of sodium chloride is
Choose an answer
simple cube
body centered cubic
face centered cubic
depends upon conditions
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Question # 60
According to kinetic theory of gases kinetic energy depends on
Choose an answer
Temperature
Collision
Pressure
Atomic number
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Question # 61
Point out the substance which has maximum vapour pressure at a given temperature?
Choose an answer
Acetone
Water
Ethanol
Acetic acid
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