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PPSC Chemistry Full Book Test MCQs With Answers
Question # 1
Buffer solution are used to.
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Increase the pH
Resist the pH
Decrease the pH
None of above
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Question # 2
Which of the following statement represent disadvantages of sanitary landfill
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Public opposition
Uneconomical
Health hazard
All above
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Question # 3
Arrange the following in order of increasing boiling point.
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CH3OH < CH3Cl < RbCl < CH4
CHOH < CH4 < CH3Cl < RbCl
RbCl < CH3Cl < CH3OH < CH4
CH4 < CH3Cl < CH3OH < RbCl
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Question # 4
Red brass contain about how many percent of zinc.
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20 %
15 %
30 %
25 %
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Question # 5
Which of the following salt is colourless.
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Zn salt
Co salt
Ni salt
Mn salt
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Question # 6
All the member of group III A are metals except.
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B
Ai
Ga
In
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Question # 7
A process in which no heat enters leaves the system is called.
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Isochoric
Isobaric
Adiabatic
Reveraible
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Question # 8
The temperature at which the vapour pressure becomes equal to external pressure is called.
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Saturation point
Critical temperature
Consolute temperature
Boiling point
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Question # 9
Soft drinks and baby feeding bottles are generally made up
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Polyeater
Polyurethens
Polyamide
Polyetyrene
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Question # 10
At constant temperature and pressure, the decrease in Gibbs free energy (F) in equal to
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Increase in entropy
Decrease in entropy
Reversible work done by the system
All types of work except the work of expansion
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Question # 11
During the titration of weak acid against NaOH the conductance of the solution after the neutralization point.
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Is constant
Decreases
Varies irregularly
Increase
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Question # 12
Setting of cement is improved by
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Lime stone
Clay
Gypsum
Water
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Question # 13
The rate of a chemical reaction is proportional to the product of the active mean of the reactants, This is a statement of.
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Law of dynamic equilibrium
Le Chatlier's principle
Law of mass action
Solubility product principle
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Question # 14
Which of the following elements has the highest value of second ionization energy.
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Lithum
Beryllium
Boron
Magnesium
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Question # 15
Select an acidic amino acid
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Lysine
Cystine
Aspartic acid
Aminoacetic acid
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Question # 16
NH3 has a not dipole moment while BF3 has zero dipole moment Thsi is because.
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NH3 is not a planar molecule while BF3 is a planar molecule.
NH3 is a planar molecule, while BF3 is a planner molecule.
Fluorine is more electronetative than nitrogen
Born is more electronegative than nitrogen
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Question # 17
The common oxidation state of lanthanides is.
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+3
+2
+1
+4
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Question # 18
In proper rotation (Cn) an object is rotated through an angle of.
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a/n radians
2n/n radians
3n/n radians
4n/n radians
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Question # 19
By applying an external force the ionic solid can be easily broken to powder form so the ionic solid are highly
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Hard
Brittle
Tough
Soft
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Question # 20
Which of the following parameter is not involved in calculations based on Born Haber Cycle.
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Ionization enthalpy
Electron gain enthalpy
Electronegativity
Bond dissociation energy
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Question # 21
Biogical role of nucleic acid doe snot include
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Genetic continuity
Protein syathesis
Hybridization
Mutation
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Question # 22
Which of the following method is used to separate small molecules form the larges molecules from the larger molecules in diffusing through a membrane.
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Dialysis
HPLC
FPLC
TLC
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Question # 23
TLC belongs to which of the following chromatographic techniques.
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Ion exchange
Partities chromatography
Adsorption chromatography
Gel permeation
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Question # 24
Which of the following acids acts as acid waste from coal mines.
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HCl
HNO3
CH3COOH
H3PO4
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Question # 25
Which of the following statements is not true with reference to ionic conductors.
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Ionic conductance is due to movement of the ions
It involves the transfer of matter
It involves oxidation reduction reactions
It decreases with rise in temperature.
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Question # 26
The main constituents of ___________ are boron oxide and silica.
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Pyrex glass
Low silica glass
Soda lime glass
Super hard glass
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Question # 27
A terpenoid which as an alcoholic group in the molecule is
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Citral
Camphor
Menthol
Carvone
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Question # 28
What is the most undesirable of all the elements commonly found in steels.
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Sulphur
Phosphorus
Silocn
Magnesium
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Question # 29
The juice is allowed to boil at lower temperatures to protect the sugar from
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Hardening
Solubility in water
Caramelization
Dwatering
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Question # 30
Lewis concept explain the formation of
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Ionic bond
Covalent bond
Co-ordinate bond
Chemical bond
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Question # 31
For an elementary reaction
2A + B ------------------- C + D
The molecularity of the reaction is.
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1
2+
3
4
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