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ECAT Chemistry Online Test MCQs With Answers
Question # 1
Ethanol is prepared in Pakistan form fermentation of:
Choose an answer
Starch
Sugar
Glucose
Molasses
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Question # 2
n + l value for 4f will
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2
5
7
9
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Question # 3
The fiber which is made from acrylonitrile as monomer:
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PVC
Rayon Fiber
Acrylic fiber
Polyester fiber
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Question # 4
On alkali and alkaline earth metals down the group, there is decreasing trend in
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m.p.
b.p.
Ionization potentiall
All of these
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Question # 5
In a hydrogen-oxygen fuel cell, combustion of hydrogen occurs to
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Generate heat
Remove adsorbed oxygen from electrode surfaces
Produce High purity water
Create potential difference between two electrodes
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Question # 6
The number of moles of CO2which contain 8.0 g of oxygen
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0.25
0.50
1.0
1.50
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Question # 7
The phenomenon of isotropy was first discovered by
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Soddy
Rutherford
Bohr
Dalton
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Question # 8
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 # 9
10% aqueous solution of NaCI has molarity
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1.7 M
2.7 M
0.17 M
3.7 M
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Question # 10
1 mole of N
2
and 2 moles of H
2
are allowed to react in a 1 dm
3
vessel. At equilibrium 0.8 mole of NH
3
is formed. The concentration of H
2
in the vessel is
Choose an answer
0.6 mole
0.8 mole
0.2 mole
0.4 mole
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Question # 11
During nitration of benzene, the active nitrating agent is
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NO3
NO2+
NO2-
HNO3
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Question # 12
Which statement is true about a free radical
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An atom with a positive charge
An atom with a negative charge
An atom with a lone pair of electrons
An atom with unpaired electron
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Question # 13
Chromium (VI) is highly toxic and can cause
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Blindness
Cancer
Liver problems
Blood problems
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Question # 14
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Proton donar
Dehydrating agent
Catalyst
Electrophile
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Question # 15
Alkyl halides on treatment with aqueous KOH give
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Phenol
Alcohol
Aldehyde
Ketone
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Question # 16
The element with highest electron affinity among the halogen is
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F
Cl
Br
I
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Question # 17
Reactions that proceed on both sides and never go to completion are called
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Irreversible reactions
Reversible reactions
Opposing reactions
Spontaneous reactions
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Question # 18
When 6s orbital is complete then next electron goes to
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6p
6d
5d
4f
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Question # 19
Acetylene when treated with 10% H
2
SO
4
in the presence of HgSO
4
adds one molecule of water to form
Choose an answer
Aldehydes
Esters
Alcohols
Acids
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Question # 20
Partial reduction of acetic acid happens with
Choose an answer
NH
3
LiAIH
4
P + HI
PCI
5
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Question # 21
In carboxyl group the bond between C and oxygen is:
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Sigma bond
Single bond
Double Bond
Triple bond
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Question # 22
Negatively charged particle nature of cathode rays was first demonstrated in 1895 by:
Choose an answer
Millikan.
J. Perrin.
Hittrof
J.J. Thomson.
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Question # 23
Compounds having the same molecular formula, but different functional groups show
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Metamerism
Position isomerism
Chain isomerism
Functional group isomerism
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Question # 24
Which of the following solutions has the highest boiling point ?
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5.85% solution of sodium chloride.
18.0% solution of glucose.
6.0% solution of urea.
All have same boiling points.
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Question # 25
Formation of a cation is:
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Exothermic process
Non-endothermic process
Endothermic process
None of above
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Question # 26
The number of isotopes of gold is
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3
1
2
4
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Question # 27
Which one of the following step is not involved in determination of empirical formula
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Determination % of each element
Determination of gram atom of each element
Determination of isotopes of each element
Determination of atomic ratio of element
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Question # 28
If a large number of amino acids (hundreds to thousands) are joined by peptide bonds, the resulting product is called
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Dipeptide
Tripeptide
Polypeptide
None of these
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Question # 29
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 # 30
Choose an answer
2-bromonitrobenzene
2-nitrobromobenzene
1-bromonitrobenzene
1-nitrobromobenzene
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Question # 31
Grignard's reagent on treatment with dry CO
2
and HCI yields
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Ester
Alcohol
Carboxylic acid
Aldehyde
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