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PPSC Chemistry Full Book Test MCQs With Answers
Question # 1
When CH3COOH is titrated against NaOH the pH as the equivalence point is.
Choose an answer
7
> 7
o
>7
6.8
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Question # 2
In a one -component system the maximum number of phase that can consist in equilibrium is.
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1
2
3
4
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Question # 3
The product obtained on heating n-heptane with Cr2O3 ____Al2O3 at 600
o
C is.
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Cycloheptane
Methyl cyclohexane
Benzene
Teluene
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Question # 4
In propagation step the reaction intermediate of radical polymerization is
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Carbocation
Carbonion
Free radical
Carbene
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Question # 5
Which of the following is the second anciently known metal.
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Nickel
Copper
Gold
Silver
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Question # 6
Which of the following method of analysis is based on diffraction of radiation.
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Mass spectrometry
Polarography
Potentiometry
Raman scattering
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Question # 7
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 # 8
The separation efficiency of a column can be expressed in terms of number of.
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Solvents used
Theoretical plates
Stationary phases
Mobile phases
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Question # 9
Xe reacts directly with
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O2
Cl2
F2
Br2
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Question # 10
The law of trinds was proposed by
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Dobereiner
Newlands
Lother Mayer
Chancourtois
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Question # 11
The phase rule was deduced by
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Gibbs
Thomson
Troution
Henry
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Question # 12
Which of the following compounds combines with hemoglobin.
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CO2
CO
NO
N2
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Question # 13
Casionic polymerization is initiated by
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BF3
NaNH2
Bul
Both b and c
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Question # 14
Increased asthmatic attacks in certain seasons are related to.
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Inhalation of seasonal pollens
Eating of seasonal vegetables
Low temperature
Wet and dry environment
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Question # 15
Zero group elements are called as
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Inert gases
Rare gases
Noble gases
All of above
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Question # 16
Which of the following statement is not true in case of catalytic reforming.
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High temperature results in loss of reformate yield
High naphthenic stock require high space velocity
Presence of water decrease the hydrocracking activity.
None of above
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Question # 17
Flourine differs from the other members of its own group due to.
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Its small size and low bond energy
Its higher electornegativity
None-availability of d-orbitals in its valence shell
All the above
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Question # 18
The rotation of plane polarized light when it posses through 1 dm of a solution containing 1 gram of the substance per cm3 of the solution is called.
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Molar rotation
Molar refraction
Specific refraction
Specific rotation
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Question # 19
Peeling of ozone umbrella is due to.
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CFCa
PAN
CO2
Coal burning
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Question # 20
The formula of copper pyrite is.
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CuFeS
CuFeS2
Cu2FEs
Cu Fe2S
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Question # 21
A half cell reaction is one that
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Occurs at one electrode
Goes only half way to completion
Involves a half mole of the concentration of the solution
Always oxidizes
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Question # 22
The unit of nucleic acid having base sugar combination is called.
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Nucliec acid
Nucleoside
Nucleotide
None of these
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Question # 23
Strongest inter molecular hydrogen bond is formed in
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H2O
NH3
HF
H2S
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Question # 24
Which sequence of steps is correct in paper making machine
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Pressing Dyring, Flow spreader Calender stock
Flow spreader, Pressing, Prying Calender sock
Drying ,Pressing , Flow spreader, Calender stock
None of above
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Question # 25
Urea an enzyme used to estimate urea is a
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Hydrolytic enzyme
Oxidative enzyme
Reductive enzyme
Iso me rising enzyme
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Question # 26
If a chemical reaction in equilibrium is subjected to a change the reaction tends to more in such a direction that the effect of the change would be neutralized This is a statement of.
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Law of mass action
Le Chatlier's principle
Henery's law
Correspondence principle
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Question # 27
Which of the following has the maximum tendency to form complexes.
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K
Na
Rb
Li
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Question # 28
Cement containing higher percentage of gypsum than required.
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Sets slowly
Sets repidly
Does not set at all
Has no effect
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Question # 29
Thermocouples have been constructed from
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Chromel ve elumel
Copper vs platinum
Both
None
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Question # 30
Al Cl3 is used in
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Manufacturing of petrol
In borax bead test
Prezervation of food
All above
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Question # 31
Indigotin is a dye obtained from indigo plant which belongs to the group of.
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Substantive dyes
Mordant dyes
Vat dyes
Disperse dyes
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