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ECAT Chemistry Online Test MCQs With Answers
Question # 1
Selection of filter paper depends upon sizes of particles to be :
Choose an answer
Tested.
Filtered.
Checked.
All of above.
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Question # 2
Denaturation of protein means the structure of protein is disrupted, indicate which factor foes not denature protein
Choose an answer
Heating protein
pH changes
Oxidising agent
Keeping pH 7.35
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Question # 3
Which substances have
Δ
H =
Δ
E
Choose an answer
Solids
Liquids
Gases
Liquids and solids
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Question # 4
Aldehydes can be distinguished from ketones by using
Choose an answer
Schiff's reagent
Conc. H
2
SO
4
Anhy. ZnCl
2
Resorcinol
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Question # 5
(CH
2
O)
n
is general formula for
Choose an answer
Monosaccharides
Oiligosaccharides
Polysaccharides
None of these
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Question # 6
Among O, C, F, Cl, Br, the correct order of increasing radii is
Choose an answer
F O C Cl Br
F C O Cl Br
F Cl Br O C
C O F Cl Br
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Question # 7
Choose an answer
High temperature
Low temperature
Low pressure
High pressure
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Question # 8
Which is not a calcareous material
Choose an answer
Lime
Clay
Marble
Marine shell
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Question # 9
In Lucas test teriary alcohol make an oily layer
Choose an answer
Immediately
In 10 mins
On heating
Not
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Question # 10
Which of the following molecules have multiple bonds
Choose an answer
CH
4
C
2
H
4
C
2
H
6
CCI
4
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Question # 11
Steel may be manufacture by two processes which two are correct
Choose an answer
Open hearth process and besemer process
Open hearth process and Haber process
Bassemer process and Haber process
Contact process and Haber process
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Question # 12
Stainless steel contains Cr upto
Choose an answer
12%
18%
10%
5%
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Question # 13
Which is a good nucleophile?
Choose an answer
F
-1
Cl
-1
Be
-1
I
-1
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Question # 14
The number of atoms present in molecule determines its:
Choose an answer
Molecularity
Atomicity
Basicity
Acidity
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Question # 15
The C-C bond angles in benzene ring are
Choose an answer
119
°
120
°
121
°
None
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Question # 16
Enzymes, in the living systems
Choose an answer
Provide energy
Provide immunity
Transport oxygen
Catalyze biochemical processes
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Question # 17
Reaction of Grignard's reagent with formaldehyde gives:
Choose an answer
pri-alcohol
sec-alcohol
ter-alcohol
carboxylic
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Question # 18
Al
3+
is a symbol for aluminium
Choose an answer
Atom
Ion
Cation
Anion
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Question # 19
The electronic configuration of an atom/ion can be defined by the following
Choose an answer
Aufbau principle
Pauli's exclusion principle
Hund's Rule
All the above
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Question # 20
Rates of organic reactions are
Choose an answer
Fast
Very fast
Slow
Non-reactive
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Question # 21
Hydrogen gas and iodine vapours combine to form Hl at 425°C, the same composition of mixture is present if we start with decomposition of Hl. It suggests
Choose an answer
A static equilibrium
Law of mass action
A dynamic equlibrium
Irreversible reaction
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Question # 22
The addition of HCN to carbonyl compounds is an example of
Choose an answer
Nucleopihlic substituion
Electrophilic addition
Nueleophilic addition
Electrophilic substitution
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Question # 23
The relation between Kc and Kp is
Choose an answer
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Question # 24
Amiino acids are building blocks of:
Choose an answer
Protein
Carbohydrates
Lipids
Fats
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Question # 25
Choose an answer
First order
Pseudo first order
Second order
Zero order
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Question # 26
Best medhod of preparation of alkyl halide from alcohals is by its reaction with:
Choose an answer
HX
SOCl
2
Px
5
and PX
3
All
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Question # 27
An alkane is produced when an alkyle halide reacts with zinc in the presence of
Choose an answer
HCl
CH
3
COOH
Both a & b
None
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Question # 28
Determination of atomic masses and invention of system of writing symbols was made by:
Choose an answer
J. Berzelius
Democritus
Dalton
None of above
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Question # 29
A state function of the system which describes together the internal energy and the work done is called
Choose an answer
Enthaply
Internal energy
Work
Free energy
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Question # 30
The word paper is derived from the name of which reedy plany
Choose an answer
Rose
Sun flower
Papyrus
Water hyacinth
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Question # 31
An ionic compound A+B is most likely to be formed when
Choose an answer
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 ionization energy of A and electron affinity of B are high.
Both ionization energy of A and electron affinity of B are low.
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