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PPSC Chemistry Full Book Test MCQs With Answers
Question # 1
According to the Langumir isotherm , when the pressure of the gas is very large, the adsorption.
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Is directly proportional to pressure
Is inversely proportional to pressure
Is directly proportional to the square of the pressure.
Is independent of pressure
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Question # 2
Which of the following compounds has highest dipole moment.
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Dichloromethane
Chloroform
Chloromathane
All above
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Question # 3
Which of the following is the weakest base.
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KOH
NaOH
LiOH
RbOH
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Question # 4
Which one of the following has the biggest electron affinity.
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F2
Cl2
Br2
I2
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Question # 5
Pick out the incorrect statement.
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Red phosphorus consists of a complied chain structure and black phosphorus has a layer structure.
Nitrogen shows a little tendency for catenation, because N-N a single bond is very strong.
The xamimum number of covalent bonds formed by nitrogen is four, since it has no d-orbitals in its valence shell
The group 15 elements do not form M5+ ions, but +5 oxidatin state is realized only through covalent bonding.
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Question # 6
Setting of cement is improved by
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Lime stone
Clay
Gypsum
Water
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Question # 7
Blue color of glass of due to the presence of .
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Cobalt (II)
Chromium (III)
Iron (III)
copper (II)
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Question # 8
Example of linear geometry
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XeF2
F2 and HgCl2
CdI2 AND Ag Cl3
All of the above
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Question # 9
Amino acids have
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Acidic group
Basic group
Both of these
None of these
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Question # 10
Codon for amino acid glycinc is not represented by base pair
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GCA
GGC
GGA
GGU
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Question # 11
The polarity of bonds can lead to polarity of molecules and affect
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Melting point
Boiling point
Solubility
All of above
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Question # 12
Bromine number is measure of.
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Paraffins
Unsaturates
Saturates
None of these
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Question # 13
Identify a dye which was ot originally obtained from plant source.
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Alizarin
Tyrian purple
Indigotin
Quercitrin
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Question # 14
What % if nickel is present in the major ore Pentlandite.
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22%
18%
14%
10%
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Question # 15
Which of the following factors does not effect the rate of the reaction.
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Pressure
Temperature
Concentration
Catalyst
All of the above
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Question # 16
The liquor is screened to exclude ________ material
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Fibrous
Polymers
Maltose
Sucrose
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Question # 17
Which of the following statement is not correct regarding galvanic cells.
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Oxidation occurs at the anode
Ions carry current inside the cell
Electrons flow around the external circuit. form cathode to anode
When the e.m.f. of the cell is positive cell reactionis spontaneous
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Question # 18
The magnitude of electron affinity depends on.
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Atomic size
Nuclear charge
Electronic configuration
All of the above
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Question # 19
Which of the following factors effect the strengths of acids and bases.
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Inductive effect
Romance effect
Hydrogen effect
All above
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Question # 20
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 # 21
The vapours attacks the eyes and mucous membrane of nose and throat
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F
Cl
I
Br
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Question # 22
Dry distillation of amino acids with barium hydroxide yields.
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Acids
Amines
Alcohols
Hydroxy acids
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Question # 23
Pick out the incorrect statement for XeF4
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XeF4 disproportionate violently with water
It is used as fluorinating agent
It has octahedral structure for geometry
It oxidizes I to I
2
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Question # 24
Smoke is a dispersion of
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Gas in gas
Gas in solid
Solid in gas
Liquid in gas
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Question # 25
A mixture of ethyl iodide and n-propyl iodide is subjected to Wurts reaction. The hydrocarbon that will nto be formed is
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n-butane
n-propane
n-pentane
n-hexane
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Question # 26
Carbon in wrought iron is present as
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Silicon carbide
Iron carbide or comentite
Graphite
Partly as iron carbide and partly as graphite
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Question # 27
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 # 28
Dyes which can be applied to cellulosic fibre from water solution are called.
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Ingrain dyes
Substantive dyes
Mordant dyes
Vat dyes
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Question # 29
Which of the following is capable of shown g optical isomersm.
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CH3COCOOH
CH3CHOHCOOH
Botha a and b
All of these
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Question # 30
During the preparation of soap the liquid separated by distillation is
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Sodium hydroxide
Oil
Fats
Glycerol
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Question # 31
Among the elements of second period the element with highest melting point belongs to group.
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1
14
17
18
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