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PPSC Chemistry Full Book Test MCQs With Answers
Question # 1
Which of the following analytical method is used for the separation of dissolved components from solutions.
Choose an answer
Chromatography
Dialysis
Solvent extraction
Distillation
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Question # 2
Which of the following process involves the use fo organic compound as an electron acceptor.
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Aerobic respiration
Anaerobic respiration
Fermentation
Glycolsis
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Question # 3
The correct order of thermal stabilities of hydriedes of group 15 is.
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NH3 > PH3 > AsH3 > BiH3> SbH3
NH3 > PH3 >AsH3 > SbH3> BiH3
NH3 < PH3 < SbH3 > AsH3 > BiH3
BiH3 > Sb H3 > AsH3 > PH3 > NH3
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Question # 4
Covalent compound are soluble in
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Polar solvents
Non polar solvent
Concentrated acids
All solvent
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Question # 5
The tensile strength of a carbon nanotube is __________ times that of steel.
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10
25
100
1000
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Question # 6
Which among the following is insoluble in water.
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LiOH
KOH
NaOH
RbOH
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Question # 7
The value of Kw increase with temperature because the ionization of water.
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Positive
Negative
Endothermic
Exothermic
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Question # 8
Which of the following radical is not a member of IV group.
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Mg
2+
Co
2+
Ni
2+
Mn
2+
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Question # 9
Which of the following statement is not true with respect to hydrocarbons.
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They are gaseous and liquids
They can be saturated or unsaturated
They in air by themselves alone cause harmful effects
They form photochemical oxidants
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Question # 10
Biomass refers to all the organic material derived from
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Photolysis
Photosynthesis
Electrolysis
Oxidation
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Question # 11
A molecule MX4 has a square planar shape, The number of non bonding pairs of electrons around M is .
Choose an answer
2
1
0
3
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Question # 12
Cobalt salt imparts which colour to the borax bead
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Blue
Green
Red
Yellow
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Question # 13
Which of the following steps is not involved in chemical analysis.
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Separation of sample in pure form
Separation of the sample in the mixture form
Preparation of sample for the analyisis
Validity of experimental results
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Question # 14
Which of the following molecule contains two dative bonds according to Lewis structure.
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NH3
SO3
PCl5
BF3
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Question # 15
The increase in boiling points of noble gases from He to Xe is due to the
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Decreases in ionization energy
Increases in polarizability
Increase in electron affinity
Increase in atomic volume
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Question # 16
The bond between two identical non metal atoms has a pair of electrons.
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Unequally shared between the two
Transferred fully from one atom to another
With identical spins
Equally shared between them
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Question # 17
The alkaline hydrolysis of fat is know as
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Condensation
Esterification
Saponification
Emulsification
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Question # 18
Which of the following statement is true.
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Ferromagnetic separation is used to remove rion impurities from bauxite.
Aluminium is an amphoteric element which means that it can act as an oxidizing agent and as a reducing agent
Aluminium has a strong attinity for oxygen
Aluminothermic reactions are endothermic
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Question # 19
Among group IA elements, melting point
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Increases down the group
Decreases down the group
Do not show any regular trend
Remains constant
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Question # 20
Which of the following is not a biodegradable polymer.
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Protein
PVC
Cellulose
Nucleic acid
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Question # 21
The Schrodinger equation when solved for any system gives.
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The mean force path
The Polarizability
The energy function
The wave function
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Question # 22
The formula of Bauxite is.
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Al2O3
Al2 O3. 2H2O
AL2O3, H2O
Na3AIF6
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Question # 23
Pick out incorrect statement about K2Cr2O7
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It oxidizes acidified solution H2SO4 to S
It oxidizes KI to I2
It oxidizes HCl to Cl2
It gives oxygen, when treated with cold conc. H2SO4
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Question # 24
Molten iron withdrawn from the blast furnace is called.
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Wrought iron
Pig iron
Bessemer iron
Stainless steel
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Question # 25
Which metal burns in air at high temperature with the evolution of much heat.
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Cu
Hg
Pb
Al
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Question # 26
CO belong to which group.
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C
2v
D
2h
C
av
D
ah
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Question # 27
A catalyst increases the rate of a reaction because.
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It provides the necessary energy to the colliding molecules to cross energy barrier
It decreases the heat of the reaction
It decreases the order of the reaction
It provides a different path of lower activation energy.
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Question # 28
Iron which contains up to 1% carbon is called.
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Steel
Cast iron
Wrought iron
Pig iron
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Question # 29
The property measured in DTA is
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Heat effects
Weight loss
Rate of change in weight
Change in temperature
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Question # 30
Which of the following ahs non zero dipole moment.
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NH3
SF6
BF3
CO2
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Question # 31
In extraction of iron, the furnace charge consists of iron ore, coke and limestone. The function of limestone is to act as.
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An oxidation agent
A reducing agent
Flux
Slag
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