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ECAT Chemistry Online Test MCQs With Answers
Question # 1
When aqueous solution of NaOH is electrolysed useing graphite electrodes, the product obtained at anode is
Choose an answer
O
2
gas
H
2
gas
Na metal
Na
2
O
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Question # 2
Grignard's reagent is
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Alkyl halide
Magnesium halide
Alkyl magnesium halide
Ethereal solution of an alkyl halide
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Question # 3
Which period starts from
11
Sc to
30
Zn ?
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First Period
Second Period
Third Period
4th Period
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Question # 4
The hydrocarbon used for polymerization is
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Alkanes
Alkenes
Alkynes
All of above
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Question # 5
Ionic hydrides are generally
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Liquid at room temperature
Good electrical conductors
Good reducing agents
Easily reduced
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Question # 6
Which one is a polymer compound?
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SO
2
CO
2
CH
4
PVC
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Question # 7
Which reaction yields Bakelite?
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Urea with HCHO
Tetramethyl glycol with Hezamethylene diisocyanate
Phenol and HCHO
Ethylene glycol and Dimethylterephthalate
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Question # 8
Among the following the most reactive towards alcoholic KOH is
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CH
2
= CHBr
CH
3
COCH
2
CH
2
Br
CH
3
CH
2
Br
CH
3
CH
2
CH
2
Br
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Question # 9
Which one of the following pentafluorides cannot be formed?
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PF
5
AsF
5
SbF
5
BiF
5
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Question # 10
Which one of the following is not a nuclelphile
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H
2
O
H
2
S
BF
3
NH
3
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Question # 11
The configuration 1s
2
2s
2
2p
5
3s
1
shows
Choose an answer
Excited state of O
2
Excited state of neon
Excited state of fluorine
Ground state of fluorine atom
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Question # 12
Phosphine is not obtained by the reaction when
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White P is heated with NaOH
Red P is heated with NaOH
Ca
2
P
2
reacts with water
PH
4
l is boiled with water
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Question # 13
Choose an answer
Neutrons are attracted by nucleus
Neutrons carry out nuclear reactions
Neutrons carry no charge
Neutrons are electromagnetic radiations
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Question # 14
The example of colligative property is
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Boiling point
Osmosis
Freezing point
Osmotic pressure
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Question # 15
The four bonds of carbon in methane are directed towards the corners of
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Cube
Pentagon
Hexagon
Tetrahedron
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Question # 16
Grignard reagent on reaction with a ketone forms
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Tertiary alcohol
Secondary alcohol
Primary alcohol
Carboxylic acid
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Question # 17
Factor which slows down the rate of reaction is
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Small size of the particles of the reactant
High temperature of reaction
More concentration of reactant
Lowering the temperature
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Question # 18
Which of the following pairs are chemically dissimilar?
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Na and K
Ba and Sr
Zr and Hf
Ca and Zn
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Question # 19
Boric acid cannot be used:
Choose an answer
An antiseptic in medicine
For washing eyes
In soda bottles
For enamels and glazes
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Question # 20
Ozone layer of stratosphere requires protection from indiscriminate use of
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Fungicides, insecticides, bactericides and medicines
Aerosols and high flying jets
Atomic explosions and industrial wastes
Baloons and turbo-prop aeroplanes
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Question # 21
Rate of chemical reaction depends upon :
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The number of total collisions per second.
Number of molecules taking part in a chemical reaction.
Number of fruitful collisions per second
Number of fruitless collisions per second.
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Question # 22
Grignard's reagent on treatment with chloramine give
Choose an answer
Acetamide
Primary amice
Secondary amice
Urea
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Question # 23
The bond order O
2
molecule is
Choose an answer
1
2
3
Zero
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Question # 24
Acetone is prepared by
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Oxidation of n-propyl alcohol
Oxidation of acetaldehyde
Pyrolysis of calcium acetate
Pyrolysis of calcium acetate as well as acetic acid
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Question # 25
The energy absorbed when an electron is added to a gaseous atom to form a gaseous ion is called
Choose an answer
Electron affinity
Ionization energy
Both of these
None of these
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Question # 26
The element with highest electron affinity among the halogen is
Choose an answer
F
Cl
Br
I
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Question # 27
Choose an answer
It decolourises aqueous bromine rapidly
It is insoluble in water
It reduces Fehling's reagent
Two molecules react with each other in the presence of a strong acid
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Question # 28
A gas bulb is filled with NO
2
gas and immersed in an ice bath at 0
°C which becomes colourless after sometimes. This colourless gas will be
Choose an answer
NO
2
N
2
O
N
2
O
4
N
2
O
5
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Question # 29
Nitroalkane are used in
Choose an answer
Fuel
Solvents
Organic synthesis
All of them
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Question # 30
In primary alkyl halides, the halogen atom is attached to a carbon which attached to how many carbon atoms?
Choose an answer
Two
Three
One
Four
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Question # 31
Choose an answer
-778.9 KJ
788.0 KJ
-1.9 KJ
+1.9 KJ
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