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ECAT Chemistry Online Test MCQs With Answers
Question # 1
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The ionization energy of A is high and electron affinity of B is low
The ionization energy of A is low and electron affinity of B is high
Both the ionization energy of A and electron off affinity of B are high
Both the ionization energy of A and electron affinity of B are low
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Question # 2
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Addition Elimination
Addition Reduction
Elimination Reduction
Substitution Elimination
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Question # 3
With the increase in size of halogen atom the reactivity of an alkyl halide
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Increases
Decreases
Remain constant
None of these
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Question # 4
Chemical equilibrium involving reactants and products in more than one phase is called
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Static
Dynamic
Homogeneous
Heterogeneous
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Question # 5
Rates of organic reactions are
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Fast
Very fast
Slow
Non-reactive
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Question # 6
A compound contains one atom of oxygen and % of O 34.78, then molecular mass of compound is
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46
78
110
180
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Question # 7
Which of the following is present in the stings of bees and wasps
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Formic acid
Citric acid
Carbolic acid
Formalin
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Question # 8
The elimination of HX from adjacent carbon atoms is called
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Halogenations
Hydrohalogenation
Dehydrohalogenation
Hydration
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Question # 9
pKb value of NH
4
OH is 4.74. If the concentration of NH
4
OH is 1 molar containing 0.1 molar NH
4
Cl, then pH of this buffer will be
Choose an answer
3.74
10.26
4.74
9.26
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Question # 10
Silver oxide battery has a voltage of
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2.0 V
1.5 V
2.5 V
1.0 V
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Question # 11
Precipitation will occur until the ionic product becomes
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Equal to K
sp
Lesser than K
sp
Greater than K
sp
None of these
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Question # 12
The shape of the molecule SF
2
Cl
2
is
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Trigonal bipyradmidal
Cubic
Octahedral
Tetrahedral
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Question # 13
Which of the following undergoes uncleophilic substitution exclusively by S
N
1 mechanism?
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Benzyl chloride
Ethyl chloride
Chlorobenzene
Isopropyl choride
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Question # 14
Primary carbon attaches with other hydrogen atoms directly:
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One
Two
Three
At least one or more than it
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Question # 15
Which of the following alcohols cannot be produced by treatment of aldehydes or ketones with NaBH
4
or LiAIH
4
?
Choose an answer
1-propanol
2-propanol
2-Methyl-2-propanol
Ethanol
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Question # 16
In a primary alkyl halide, the halogen atom is attached to a carbon which is further attached to
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Only one carbon atom
Two carbon atoms
Three carbon atoms
one or no carbon atom
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Question # 17
Which of the following molecules has a net dipole moments
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CO
2
CS
2
SO
2
CCI
4
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Question # 18
Which of the following compounds on boiling with KMnO
4
(alk) and subsequent acidification will not give benzoic acid?
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Benzyl alcohol
Acetophenone
Anisole
Toluene
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Question # 19
Which element does not belong to 4d series
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Y
Zr
Mo
Zn
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Question # 20
Lead accumulator stops discharging current when
Choose an answer
Lead at anode converted to PbO
2
PbO
2
at cathode converted to Pb
Both electrodes are completely covered with PbSO
4
Both electrodes are completely covered with Pb(OH)
2
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Question # 21
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Temperature is increased
Pressure is increased
HCl is added
HCl is removed
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Question # 22
The chemical formula of Epson salt is
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MgSO
4
MgCl
2
MgSO
4
. 7H
2
O
MgCl
2
. 7H
2
O
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Question # 23
The major components of coal gas are
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Hydrogen and methane
Ethane and carbon monoxide
Nitrogen and ethane
Ethane and carbon dioxide
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Question # 24
Elevation of boiling point is measured by
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Beckmann's apparatus
Lands Berger's method
Antifreeze apparatus
None of these above
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Question # 25
The fibre which is made from vinylidine chloride polymer is called
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Rayon fibre
Azlon fibre
Acetate fibre
Saran fibre
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Question # 26
The percentage of nitrogen in ammonium nitrate is
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32 - 33.5%
34 - 36%
40 - 45%
None of these
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Question # 27
Which of the following was discovered first:
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Charge to mass ratio of electrons.
Mass of electrons.
Charge of electrons.
All of above at same time.
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Question # 28
Polythene is a polymer of
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Ethane
Ethene
Acetone
Propylene
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Question # 29
Tollen's reagent is
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Ammonical cuprous chloride
Ammonical cuprous oxide
Ammonical silver bromide
Ammonical silver nitrate
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Question # 30
The value of R(General Gas Constant) is
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8.3134 JK
-1
mole
-1
1.987 Cal K
-1
Mole
-1
Both a and b
1.987 JK
-1
mole
-1
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Question # 31
Acetone reacts with HCN to form a cyanohydrin. It is an example of
Choose an answer
Electrophilic addition
Electrophilic substitution
Nucleophilic addition
Nucleophilic substitution
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