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ECAT Chemistry Online Test MCQs With Answers
Question # 1
Reactivity of alkyl halides with magnisium is of the order:
Choose an answer
Rl > RBr> RCl > RF
RBr > RCl >RF > Rl
RCL > RF > Rl > RBr
RF >RI >RBr > RII
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Question # 2
Weakest acid among the followings is
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Acetic acid
Phenol
Water
Acetylene
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Question # 3
Alcohols of low molecular weight are
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Soluble in water
Soluble in water on heating
Insoluble in water
Insoluble in all solvents
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Question # 4
Compound X has molecular formula C
10
H
14
O and is unreactive towards mild oxidising agents. What is the structure of the compound formed by dehydration of X
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Question # 5
Benzene is obtained from benzene sulphonic acid by treating with
Choose an answer
HCl
NaOH
H
2
O
NaHCO
3
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Question # 6
From the following values of dissociation constants of four acids which value represents the strongest acid?
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2 x 10
-2
0.02 x 10
-1
3 x 10
-4
2 x 10
-4
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Question # 7
The acid showing salt like character in aqueous solution is
Choose an answer
Acetic acid
Benzoic acid
Formic acid
α - Aminoacetic acid
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Question # 8
Hydrolytic coversion of sucrose into glucose and fructose is known as
Choose an answer
Induction
Inversion
Insertion
Inhibition
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Question # 9
C
2
H
5
OH can be differentiated from CH
3
OH by
Choose an answer
Reaction with HCl
Reaction with NH
3
Iodoform test
Solubility in water
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Question # 10
Solvent extraction method is a particularly useful technique of separation when the product to be separated is:
Choose an answer
non-volatile or thermally unstable.
volatile or thermally stable.
non-volatile or thermally stable.
volatile or thermally unstable.
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Question # 11
Ketones are prepared by the oxidation of:
Choose an answer
Primary alcohol
Secondary alcohol
Tertiary alcohol
None of these
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Question # 12
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Question # 13
During reaction of O
2
and alkenes, a product:
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Glycol
Epxide
Halohydrin
Ethylene glycol
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Question # 14
NaHCO
3
is commonly called
Choose an answer
Soda ash
Baking soda
Washing soda
None of these
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Question # 15
Calcium acetate when dry distilled gives
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Formaldehyde
Acetaldehyde
Acetone
Acetic anhydride
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Question # 16
The diameter of atoms is of the order:
Choose an answer
2* 10
-5
m
2* 10
-10
m
2* 10
-2
m
2* 10
-3
m
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Question # 17
The four quantum numbers of the valency electron of potassium are
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4,1,1,1/2
4,0,0,1/2
4,1,0,1/2
4,4,0,1/2
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Question # 18
The number of bonds in nitrogen molecule is
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Question # 19
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 # 20
Chromium (VI) is highly toxic and can cause
Choose an answer
Blindness
Cancer
Liver problems
Blood problems
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Question # 21
To differentiate isomers we use
Choose an answer
n-
iso-
neo
All of them
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Question # 22
The ore CaSO
4
2H
2
O has the general name
Choose an answer
Gypsum
Dolomite
Calcite
Epsom salt
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Question # 23
Which one of the following gases is used for artificial ripening of fruits
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Ethane
Ethyne
Methane
Propane
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Question # 24
Increasing skin cancer and high mutation rate are due to
Choose an answer
Acid rain
Ozone depletion
CO pollution
CO
2
Pollution
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Question # 25
Which of these polymers is a synthetic polymer?
Choose an answer
Animal fat
Starch
Cellulose
Polyester
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Question # 26
The unit of rate constant K is
mole
-1
dm
3
for a chemical reaction, the order of reaction is :
Choose an answer
Order of reaction can determined by an experiment
Order of reaction can determined from a balance equation only.
Order of reaction can determined increases by increasing temperate.
Order of reaction must be in whole number and not in fraction.
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Question # 27
The depression of freezing point is directly proportional to
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Mole fraction of the solution
Molarity of the solution
Molality of the solution
Molarity of the solvent
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Question # 28
Water which his considered to be safe for human consumption is known as
Choose an answer
Distilled water
Contaminated water
Potable water
Rain water
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Question # 29
The bond angle H - O - H in ice ins closest to
Choose an answer
120
° , 28
'
60
°
90
°
109
°
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Question # 30
Refrectrometric method is used when
Choose an answer
Reactions involving absorption of I.R. or U. V
Reactions involving change of refractive index
Reactions involving ions
Change of optical activity
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Question # 31
A compound having empirical formula C
3
H
3
O and its molecular mass is 110.02. Its molecular formula is
Choose an answer
C
3
H
3
O
C
6
H
6
O
2
C
9
H
9
O
3
C
3
H
6
O
2
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