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PPSC Chemistry Full Book Test MCQs With Answers
Question # 1
The expected specific wastes of textile industry is
Choose an answer
Cloth residue
Fibre residue
Dyes
All above
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Question # 2
Turpentine is obtained from._______________
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Oak tree
Pine tree
Birch tree
Lemon tree
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Question # 3
Which of the following is the cause of Brownian movement of colloidal particles.
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Convection currents int he fluid
Bombardment by the molecules of the dispersion medium
Setting of dispersed phase under gravity.
Thermal gradient in the medium
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Question # 4
Isotopes are atoms whom nuclei have the same atomic number but different mass numbers. A specific isotope has an atomic number of 18 and a mass number of 35. How many electrons are there in the neutral atom.
Choose an answer
17
18
34
35
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Question # 5
Orion is polymer of.
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Styrene
CF2 = CF2
Vinyl chloride
Acrylontrile
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Question # 6
The molarity of a 500 mL solution containing 4 g NaOH
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0.1
0.2
0.3
0.4
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Question # 7
An optically active compound
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Must contain at least favour carbons
When in solution rotate the plane of polarized light
Most always contain an asymmetric carbon atom
In solution always give negative reading in polarimetre
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Question # 8
When two H atoms approach each other then forces operates.
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Attractive forces
Repulaive forces
Attractive and repulsive
None of above
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Question # 9
Which of the following statements is not a part of Bohr's theory of the hydrogen atom.
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An electron in an atom revolves aroung the nucleus only in circular paths.
An electron does not absorb energy in the stationary orbit
An electron does not emit energy in the stationary orbit
Energy is emitted or absorbed in a discrete amount from the stationary orbit
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Question # 10
For an average exposure of 8 hours per day, the maximum permissible concentration limit of CO in the atmosphere is.
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50 ppm
500 ppm
10
3
ppm
20 ppm
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Question # 11
Green houses are responsible for keeping our plant warm and sustaining life on the earth.
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CO2 & water vapours
CO2 & CFC
CO2 & H2O
CO2 & CH4
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Question # 12
Which of the following item is not symmetry element.
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Pllane of symmetry
Inversion centre
Improper rotation
Optical activity
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Question # 13
Conductometry is based on
Choose an answer
Electric current
Electrical potential
Absorbance
Electrical conductance
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Question # 14
The range of sound pressure for uncomfortable level is.
Choose an answer
80 - 90 dB
100 - 120 dB
130-140 dB
All above
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Question # 15
The correct order of ionization energies of alkali metals is.
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Li > Na > K > Rb
Na > K > Rb > Li
Rb > K > Na > Li
Rb > K > Li > Na
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Question # 16
The size of iso electronic species - F- , Ne, and Na+ is affected by
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Nuclear charge (Z)
Valence principal quantum number (n)
Electron electron interaction in the outer orbital
None of the factors because their size to the same.
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Question # 17
Helium is used in weather balloons and airships instead of H2 becuse it is.
Choose an answer
Lighter than hydrogen
Incombustible
More abundant than hydrogen
Radiactive
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Question # 18
The law of trinds was proposed by
Choose an answer
Dobereiner
Newlands
Lother Mayer
Chancourtois
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Question # 19
Which of the flowing operator combination would yield eight value equation
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d/x (sin x)
d/dx (cos x)
d /dx (sin 4x)
d /dx (cos 4x)
d/dx (e
x
)
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Question # 20
The formula of bleaching powder is.
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Ca OCl2
CaCIO3
Ca(CIO)3)2
CaOCI
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Question # 21
Used in TV sets and sound movies to give ready response to electrical potential
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He
Ne
Ar
Kr
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Question # 22
Which of the following is not a component of a gas chromatography system.
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Carrier gas
Capillary column
Packed column
Cathode lamp
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Question # 23
Which of the following hydroxide is amphoteric.
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B(OH)3
Al(OH)3
Ga (OH)3
In (OH)3
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Question # 24
The process requirieng the absorption of energy of.
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F = F
Cl = Cl
H = H
O = O
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Question # 25
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 # 26
Enantiomers have which of the following characteristics.
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Rotate ordinary light
Have the same melting point
Are superimposable mirror images
React with optically active molecule at the same rate
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Question # 27
Which of the following statement is not true with respect to photo chemical reactions.
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These take place in the presence of light
Free energy of these reactions may be positive or negative
Light intensity affect these reactions
Temperature has significant affect n rate of these reactions
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Question # 28
HCIO2 gives the structure of a.
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Linear
Angular
trigonal pyramidal
Tetra hddral
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Question # 29
Which of the following is not a characteristic of dye.
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It must have suitable colour
It must be able to fix to fibre
It must be fast to wash and lights
It must be highly soluble in water
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Question # 30
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 # 31
Low quality steels with an M. Suffix on the designation intended for non structural application is classified as.
Choose an answer
Merchant quality
Commercial quality
Drawing quality
Low quality
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