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PPSC Chemistry Full Book Test MCQs With Answers
Question # 1
Final paper wound in the form of a real having final moisture of about.
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6-8%
9 - 12 %
13-15 %
4 - 10%
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Question # 2
A general trend in the properties of elements of carbon family shows that with increase in atomic number.
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The tendency towards concatenation increases
The tendency to show +2 oxidation state increase
Metallic character decreases
The tendency to form complexes with convalency higher than four decreases.
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Question # 3
Oxalic acid when heated withe conc. H2SO4 it gives out.
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H2O and CO2
CO and CO2
CO2 and H2S
Oxalic sulphate
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Question # 4
Green houses are responsible for keeping our plant warm and sustaining life on the earth.
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CO2 & water vapours
CO2 & CFC
CO2 & H2O
CO2 & CH4
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Question # 5
d2 sp3 is oriented in a manner
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Trigonal
Tetrahedral
Octahedral
Trigonal bipyramidal
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Question # 6
Which of the following represents the correct order of ionic radii
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La+ < Na+ < K+ < Rb+
Li+ > Na + > K+ >Rb+
Li = Na + = K+ = Rb+
Rb +> Na+> K+ > Li+
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Question # 7
Which of the following chloride is soluble in hot water.
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Hg2Cl2
AgCl
PbCl2
All above
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Question # 8
The number 8.47 is rounded to
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8.5
8.4
8.7
8.6
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Question # 9
A correct reaction mechanism for a given reaction usually is.
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The same as the balanced chemical equation
Obvious if its heat of reaction is known
Sometimes difficult to prove
Obvious if the activation energy is known
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Question # 10
The most suitable method of separation in mixture of o-and p- nitrophenol is.
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Steam distillation
Chromatography
Ion-exchange
Sublimation
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Question # 11
Valences bond theory was put forward by
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Pauling and Slatter
Heitler and London
Lewis
Pauli
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Question # 12
The width of a carbon nano tube is.________ nm
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1
1.3
2.5
10
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Question # 13
What term is used to denote a family of thermosetting polymers that are reaction products of alcohols and acids.
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Alkaline
Alkydes
Alcocide
Ketones
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Question # 14
Which of the following does not represent Lewis acid.
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ZnCl2
FeCl2
BF3
Bul4
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Question # 15
The process of passing of a precipitate into colloidal solution, on adding an electrolyte is called.
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Dialysis
Peptization
Electrophoresis
Electromsmosis
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Question # 16
Fullerene or bucky ball is made up of ________ carbon atoms.
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100
20
75
60
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Question # 17
The strongest acid is.
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HNO2
HNO3
H2N2O2
HNOS
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Question # 18
Which of the following health effect is caused by cadmium.
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Hypertension
Cardiovascular problem
Kidney damage
All above
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Question # 19
Hydrocarbon X (C6H12) on oxidation with hot alkaline (KMnO4) gives a mixture of prop ionic acid and dimethyl ketone. The structure of compound X is
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CH3CH = CHCH2CH2CH3
(CH3)2 C = CH CH2 CH3
CH3CH2CH = CHCH2CH3
(CH3)2 C = C (CH3)2
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Question # 20
According to the Debye-Huckel theory of strong electrolytes, and ion moving in an atmosphere of oppositely charged ions experience a drag This effect is known as
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Aaymmetric effect
Electrophoretic effect
Inter ionic effect
Concentration effect
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Question # 21
The velocity possessed by maximum fraction of molecules at a given temperature is called.
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Average velocity
Root mean aquare velocity
Most probable velocity
None of the above
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Question # 22
The common temperature detecting device in DTA are.
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Thermocouples
Thermopiles
Thermistore
All
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Question # 23
In the Lewis formula of which of the following species, the number of single double and dative bonds are equal.
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N2O3
HNO3
SO2
SOCl2
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Question # 24
Which of the following properties of a system does not change in a state of equilibrium.
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Density
Pressure
Colour
All above properties
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Question # 25
Which of the following is homopolymer.
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Starch
Plexiglas
Orlon
All of these
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Question # 26
Finely divided iron combines with CO to give.
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Fe(CO)5
Fe2(CO)9
Fe(CO)12
Fe(CO)6
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Question # 27
The chief ore of aluminium is.
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Cryolite
Bauxite
Kaolin
Carnalite
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Question # 28
The pink colour of phenolphthalen in in basic medium is due to the
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Cationic form
Anionic form
Natural form
OH- ions of the base
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Question # 29
1-Chlorobutane on reaction with alcohols potash gives.
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1- butane
1-butanol
2- butane
2- butanol
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Question # 30
The hardest material found in nature is
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Steel
Topaz
Diamond
Quartz
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Question # 31
Which of the following electrode is normally used as reference electrode for a potentiometer.
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Platinum electrode
Calomel electrrode
Silver electrode
Copper electrode
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