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PPSC Chemistry Full Book Test MCQs With Answers
Question # 1
The ease of hydrohalogenation of alkyl halide with alcoholic KOH is.
Choose an answer
3
o
> 2
o
> 1
o
3
o
< 2
o
<1
o
3
o
> 2
o
< 1
o
3
o
< 2
o
> 1
o
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Question # 2
A high frequency sound has frequency
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100 Hz
200 HZ
300 Hz
500 Hz
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Question # 3
The decrease in electron density at one position accompanied by a corresponding increase at other position is called.
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Inductive effect
Asymmetric effect
Electromeric effect
Resonance effect
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Question # 4
A mixture containing S2- and SO4 ions on trating with dil HCl will produce
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H2S gas
SO2 gas
H2S and SO2 gas
CO
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Question # 5
Greenish yellow gas with pungent irritating odour
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Chlorine
Fluorine
Iodine
Bromine
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Question # 6
In an adiabatic system, if work in done, the temperature must.
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Increase
Decrease
Remain the same
Increase than decrease
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Question # 7
Which of the following ions is smallest in size.
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F-
Cl-
I-
Br-
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Question # 8
All cycle engines working reversibly between same temperature of source and sink have the same efficiency This is the statement for the.
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Carnot cycle
Carnot theorem
Narnst theorem
Second law of thermodynamics
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Question # 9
For a given mass of a gas, if pressure in reduced to half and temperature in doubled, then volume.
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2V
2
4V
8 V
V
2
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Question # 10
What cast iron has modular or spheroidal graphite?
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Ductile iron
Gray iron
White iron
Raw iron
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Question # 11
Which is not an ore of aluminium.
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Baxuite
Cryolite
Monazite
Corundum
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Question # 12
CIF is
Choose an answer
Chlorine monoflouride
Fluourine
Monochlorine fluoride
Monofluorine chloride
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Question # 13
Pick out incorrect statement regarding HF
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It is used for making chlorofluorocarbon used as refrigerating fluids and as propellants in aerosols
It is used in making ASIF3 and synthetic cryolite
Aqueous HF is used for etchine glass
HF does not react with B2O3 even in presence of conc. H2SO4
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Question # 14
The denationalization involving C - H sigma bond electrons is known as .
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Conjugation
Hyperconjugation
Mesomerism
Resonance
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Question # 15
Which of the following reactions is employed to produce ozone in the laboratory.
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Exposure of air to UV light
Reaction of F2 with H2O at low temperature
Reaction SO2 with H2O2
Passage of silent electric discharge through oxygen
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Question # 16
Which of the following symmetry element leaves the molecule or an object unchanged.
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Proper rotation
Improper rotation
Inversion axis
Identity
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Question # 17
The bond length of C = C is
Choose an answer
1.20 A
o
1.34 A
o
1.54 A
o
1.68 A
o
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Question # 18
Which of the following is the correct order of interactions.
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Covalent < hydrogen bonding < Van Der Waal's < dipole -dipole
Van der Waal's < hydrogen bonding < dipole -dipole < covalent
Van der Waal's < dipole -dipole < hydrogen bonding < covalent
Dipole-dipole < Van der Waal's < hydrogen bonding < covalent
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Question # 19
A
o
or 10 Dq is called crystal field.
Choose an answer
Energy
Splitting energy
Stabilization energy
None of above
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Question # 20
Co enzyme cna be separated from enzyme by
Choose an answer
Precipitation
Dalysis
Hydrolysis
Distillation
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Question # 21
The thermal conductivity of an SWNT along length is _____ watt/(m.k)
Choose an answer
35
330
386
3500
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Question # 22
The formula of copper pyrite is.
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CuFeS
CuFeS2
Cu2FEs
Cu Fe2S
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Question # 23
Which of the following is not a proper use of Ni.
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It is used as catalyst
It is used in alloy formation
It is used in the preparation of Monel metal
It is attached by alkalis
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Question # 24
The maximum oxidation shown by managanese is.
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+2
+7
+4
+5
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Question # 25
In the process of electrosmosis
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Colloidial particles move towards the electrodes
Both colloidal particles and dis persons medium move
Only dispersion medium moves to carry the current
Positively charged colloidal particles move, but negatively charged particles remain stationary
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Question # 26
Which of the following compounds combines with hemoglobin.
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CO2
CO
NO
N2
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Question # 27
Which are not considered member of d-block elements.
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Zn
Cd
Hg
All above
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Question # 28
Water is often treated with chlorine to
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Increases oxygen content
Kill germs
Cause sedimentation
Remove insoluble impurities.
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Question # 29
In graph of atomic volume versus atomic weight the elements corresponding to peaks in the curve belong to.
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Group 1
Group 18
Group 4
Group 14
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Question # 30
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 # 31
Given A + 3B ____________ 2C + D
This reaction is first under with respect to reactant A and second order with respect to reactant B . If the concentration of A is doubled and the concentration of B is halved, the rate of the reaction would _____ by factor of _____________
Choose an answer
Increase ,2
Decrease ,2
Increase ,4
Decrease ,4
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