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PPSC Chemistry Full Book Test MCQs With Answers
Question # 1
Which of the following methods is used in qualitativ eanalysis.
Choose an answer
Physical method
Chemical method
Instrumental method
All above
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Question # 2
Which of the following statement is related with CO.
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It is a colorless and tasteless gas
It has less affinity to words hemoglobin
It has a boiling point of -192
o
C
It is a dangerous asphyxiant
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Question # 3
The 'shape' of molecule ." Xe F6 is.
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Pentagonal bipyramidal
Regular octahedral
Distorted octahedral
Square planar
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Question # 4
A group that causes deepning of the colour is known as
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Bathchromic
Hypsochromic
Hypochromic
Hyperchromic
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Question # 5
Ingold's isoprence rule states that in terpenoids isopren units are joined.
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Head to tail
Head to head
Tail to tail
In a random order
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Question # 6
Metals are
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Transparent
Tranalucant
Opaque
None of above
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Question # 7
Which of the following mixture is used as most popular flame in AAS.
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Acetylene air
Acetylene O2
Hydrogen air
Hydrogen O2
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Question # 8
The speed of a chemical reaction
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Is constant no matter what the temperature is.
Is independent of the amount of contact surface of a solid involved
Between gases should is all cases be extremely repid because the average kinetic energy of the molecules is great
Between ions in aqueous solution is extremely rapid because there are no bonds that need to be broken
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Question # 9
The large increase in the rate of a reaction on rise in temperature is due to.
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The lowering of activation energy
The decreases in mean free path
The increase in collision frequency
The increase in the number of molecules having more than the threshold energy
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Question # 10
The rising world temperature will have serious effect on.
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Agriculture
Animal production
Human being
All above
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Question # 11
Which of the following statements about anhydrous aluminium chloride is correct.
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It exist as AlCl3 molecules
It is not easily hydrolysed
It sublimes at 100
o
C under vacuum
Boron does not form B
3+
ions
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Question # 12
The atomic and ionic radii value on moving from left to right in the sereis.
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Increase
Decrease
Does not change
None of above
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Question # 13
Lux -Flood concept is a dono-acceptor system of.
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Proton
Electron pair
Neurtron
Oxide ion
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Question # 14
The green colour of glass is due to the presence of.
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Chromium (III)
Cobalt (II)
Mn (IV)
Iron(III)
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Question # 15
The elements with highest electron affinity belongs to.
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Period 2 , group 17
Period 3, group 17
Period 2, group 18
Period, 2 , group 1
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Question # 16
In Dumas method, the volume of the gas collected is equivalent to which of the following gases set free from the compound.
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Ammonia
O2
N2
NO
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Question # 17
The Ostwald process is the main method for the manufacture of nitric Acid in the fist step in this process is.
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Nitrogen and hydrogen react to form NH3
Ammonia is burned in O2 to generate N2 and H2O
Nitrogen and oxygen react to form NO2
Ammonia is burned with O2 to generate NO and H2O
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Question # 18
DDT is
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Biodegradable pollutant
Nodegradable contaminant
Air pollutant
An antibiotic
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Question # 19
The hydrogen bond is strongest in.
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O - H .............S
S - H.............O
F- H....................F
F - H...............O
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Question # 20
HCIO evolves Cl2 and O2 when dissolve
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Ca
Ni
Cu
Any of above
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Question # 21
Which of the following can be used as drying agent of ammonia.
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CaO
Anhydrous CaCl2
P2O5
Conc. H2SO4
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Question # 22
The maximum noise level at which a man can work for 8 hours is.
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80 dB
70 dB
90 dB
60 dB
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Question # 23
Stainless steel contains.
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Fe + Cr+ Ni
Fe + Ni + Cu
Fe + Cr+ Cu
Cu + C + Ni
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Question # 24
Used in producing intense light in cinematography
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Xenon
Krypton
Radon
Helium
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Question # 25
The law of trinds was proposed by
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Dobereiner
Newlands
Lother Mayer
Chancourtois
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Question # 26
Which of the following statement is not true regarding Open Hearth process.
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No iron is lost
The process is economical and simple
Steel obtained is of high quality
Scrap iron cannot be used in this process.
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Question # 27
Which of the following physical property forms the basis of radio chemicals methods of analysis.
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Absorption of light
Emission of light
Radioactivity
Thermal conductivity
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Question # 28
What is the possible number of optical isomers for a compound contained 2 dissimilar asymmetric carbon atoms.
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2
4
6
8
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Question # 29
Which of the following statement is not correct with respect to electrometric effect.
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It is permanent effect
It is brought into play instantaneously at the demand of attacking reagent
It proceeds a polar addition reaction
The original electronic condition is restored after the removal of tacking regent.
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Question # 30
Which of the following techniques is used to reduce the need for large volumes of organic solvents.
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Solid phase extraction
Gel permeation
Electrophoresis
TLC
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Question # 31
In the Friedel-Craft acylation, the amount of AlCl3 tha tmust be taken is
Choose an answer
In catalytic amount
One equivalent
More then one equivalent
Amount does not matter
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