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ECAT Chemistry Online Test MCQs With Answers
Question # 1
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Electronphilic substitution
Electrophilic addition
Free radical substitution
Nuclephilic substitution
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Question # 2
A molecule in which sp
2
hybrid orbitals are used by the central atom in forming covalent bonds in
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He
2
SO
2
PCl
5
N
2
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Question # 3
The presence of a double bond in a compound in the sign of:
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Saturation
Unsaturation
Subsitution
None
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Question # 4
Purine derivative among the following bases is
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Thymine
Uracil
Guanine
Cytosine
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Question # 5
During the process of crystallization, the hot saturated solution:
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is cooled very slowly to get large size crystals
is cooled at a moderate rate to get medium sized crystals of the product
is evaporated to get the crystals of the products
is mixed with an immiscible liquid to get the pure crystals of the product.
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Question # 6
For the above reaction the relationship b/w k
c
and k
p
will be :
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K
p
= K
c
RT
Kp = K
c
(RT)
-1
K
p
= K
c
(RT)
-2
K
c
= K
p
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Question # 7
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0.5
4.0
2.5
0.25
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Question # 8
Primary and secondary alcohols on action of red hot copper give
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Aldehydes and ketones respectilvely
ketones and aldehydes respectively
Only aldehydes
Only ketones
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Question # 9
When electron jumps from n
2
= 2,3,4,5,.... orbit to n
1
= 1 orbit in the hydrogen atom, the radiations emitted give the spectral lines
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Lyman series
Blamer series
Paschen series
Brackett series
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Question # 10
The catalytic prmoter used for the industrial preparation of acetaldehyde is
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PdCI
2
CuCI
2
Pd + CaCI
2
None of these
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Question # 11
The solubility product of Ca(OH)
2
is 6.5 x 10
-6
. The concentration of OH
-
ions is
Choose an answer
1.175 x 10
-2
2.35 x 10
-2
3.25 x 10
-3
3.25 x 10
-4
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Question # 12
Phosphate pollution is caused by
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Weathering of phosphate rocks only
Agricultural fertilizers
Phosphate rocks and sewage
Sewage and agricultural fertilizers
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Question # 13
The strongest acid among the following aromatic compound is
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Ortho-nitrophenol
Para-chlorophenol
Para-nitrophenol
Meta-nitrophenol
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Question # 14
The electron in an atom
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moves randomly around the nucleus
has fixed space around the nucleus
is stationary in various energy levels
moves around its nucleus in definite energy levels
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Question # 15
The main structure features of proteins is
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An ester linkage
An ether linkage
The peptide linkage
All
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Question # 16
The melting point is lowest for
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Be
Mg
Ca
Sr
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Question # 17
The best buffer is prepared when molar concentrations of the salt and acid are equal, then its pH and pKa value are related
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pH = pKa
pH < pKa
pH > pKa
pH x pKa = 14
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Question # 18
Which is possible in ethers?
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Reactivity high
Oxidation and reduction
Reactivity towards bases
Towards acids
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Question # 19
Which of the following is fully fluorinated polymer?
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Neoprene
Teflon
Thiokol
PVC
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Question # 20
For which mechanisms, the first step involved is the same:
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E
1
and E
2
E
2
and SN
2
E
2
and E
1
E1 and SN
1
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Question # 21
When a bond breaks
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Heat is evolved
Heat is absorbs
No change in heat contents takes place
Temperature increases
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Question # 22
The compound prepared by a substitution reaction of benzene is
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Acetophenone
Glyoxal
Cyclohexame
Hexabromo cyclohexane
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Question # 23
Benzene does not undergo polymerization and it is also resistant to
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Reduction
Oxidation
Alkylation
Ozonolysis
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Question # 24
Surface and ground water sources are contaminated by various human activities. Which of the followings is not a human activity that causes contamination in fresh water
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Live stock waste
Oil leaks and spills
Disposal of industrial effluents
Rain
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Question # 25
Hydrolysis of sucrose is called
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Inhibition
Saponification
Inversion
Hydration
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Question # 26
All reactions occur in :
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A single step.
A series of steps
Two steps.
Both (a) and (b)
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Question # 27
Mustard gas is a
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Gas
High boiling speed
High melting liquid
Steam
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Question # 28
An electron has principal quantum number 3. The number of its 1 subshell and 2 orbitals would be respectively
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3 and 5
3 and 7
3 and 9
2 and 5
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Question # 29
The molarity of solution containing 14.5 grams urea (N
2
H
4
CO) dissolved in 100 cm
3
of the solution is
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1 molar
0.1 molar
0.2 molar
0.25 molar
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Question # 30
Enzymes catalyse all biological reactions occurring in the cell. What is true about an enzyme
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Enzyme is a small molecule
Enzyme is acidic in nature
Enzyme is a protein
Enzyme is a lipid
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Question # 31
The branch of chemistry which deals with thermal energy changes in chemical reactions is called
Choose an answer
Chemical kinetic
Thermodynamics
Thermochemistry
Mechanics
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