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PPSC Chemistry Full Book Test MCQs With Answers
Question # 1
In vinyl cyanide, the number of a bonds in
Choose an answer
2
3
1
4
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Question # 2
Which number of halogen family does not show positive oxidation state.
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Fluorine
Chlorine
Bromine
Iodine
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Question # 3
Photochemical among is generally formed
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In early hours of winters
Around mid day in summer months
When intensity of solar radiation sis very low
When concentration of particulate matter is very low.
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Question # 4
Which of the following orbitals has maximum penetration effect.
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s
p
d
f
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Question # 5
The angle between corresponding planes forming the external surfaces of the crystal remains constant for a given substances This is known as.
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Steno's law
Henry's law
Bragg law
Pascal law
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Question # 6
Helium is used in weather balloons and airships instead of H2 becuse it is.
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Lighter than hydrogen
Incombustible
More abundant than hydrogen
Radiactive
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Question # 7
The ionization energy of N is more than that of oxygen becasue.
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Nitrogen has half filled p orbitals
Nitrogen atom is smaller in size than oxygen atom
Nitrogen contains less number of electrons
Nitrogen is less electronegative
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Question # 8
The electrical resistance of stainless steels can be as much as______ time that of carbon steel.
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5
6
10-
15
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Question # 9
Which of the following level is an indicator of hearing loss.
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> 25 dB
< 25 dB
<20 dB
None of these
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Question # 10
Which of the following molecules have centre of symmetry.
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H2O
HCl
CO2
H2SO4
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Question # 11
Which of the following is not true as compared with alkaline earth metals.
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Alkali metals are more reactive
Alkali metals have lower density
Alkali metals are more electro positiveness
Alkali metals have stronger metallic bonds
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Question # 12
The alkali metal with highest melting point is
Choose an answer
K
Na
Li
Ca
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Question # 13
BCl3 is an example of hybridization
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sp
sp2
sp3
None of above
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Question # 14
Oxides ores of Aluminium
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Corundum
Bauxite
Diaspore
All above
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Question # 15
The branch of chemistry dealing with the study of reactions in the Uv visible region of the spectrum in known as.
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Kinetics
Photo chemistry
Surface chemistry
Catalysis
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Question # 16
Which of the following cells is used to produce electricity from chemical reaction
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Electroytic cell
Galvanic cell
Voltaic cell
Fuel cell
Both C and D
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Question # 17
Potassium reacts with excess of oxygen to form
Choose an answer
K2O
K2O2
KO2
K2O3
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Question # 18
The formula of bleaching powder is.
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Ca OCl2
CaCIO3
Ca(CIO)3)2
CaOCI
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Question # 19
Metallic magnesium is obtained by
Choose an answer
Reduction of MgO with Coke
Electrolysis of an aqueous solution of MgCl2
Electrolysis of molten MgCl2
Displacement of magnesium by iron form MgCl2 solution.
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Question # 20
Pauling has suggested that the calculate of energy can be improved by considering.
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Screening effect
Polarization effect
Both A and B
None of abvoe
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Question # 21
For quality control of Portland cement, the test essentially done is.
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Setting time
Soundness
Tensile strength
All
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Question # 22
An ionic compound X + Y - is most likely to be formed if
Choose an answer
Ionization enthalpy of X is high electron gain ethalpy of Y is low
Ionization enthalpy of X is high electron gain enthalpy of Y is high
Ionization enthalpy of X is low,electron gain enthalpy of Y is low
Ionization enthalpy of X is low electron gain enthalpy of Y is high
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Question # 23
The maximum absorption in [Ti(OH)2)6 3+ take place at wavelength of.
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4000 A
o
5000 A
o
6000 A
o
10000 A
o
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Question # 24
Oxidative enzymes are responsible for
Choose an answer
Biological processes
Biological oxidation
Biological hydrolysis
Biological isomerisation
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Question # 25
Electronegativity of oxygen is.
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2,5
3,5
2,4
2.1
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Question # 26
Which of the following statements regarding covalent bond is false.
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The electrons are shared between atoms.
The bond in non -directional
The strength of the bond depend upon the extent of overlapping
The bond formed may be polar or non-polar
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Question # 27
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 # 28
Among the elements of third period, the element with lowest boiling point belongs to group.
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1
14
16
18
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Question # 29
Which of the following unit cells has least symmetry.
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Monocline
Cubic
Triclinic
Tetragona
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Question # 30
Which of the following a -amino acid is not capable of exhibiting optical isomerism.
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Glycine
Leucine
Arginine
Alanine
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Question # 31
Which of the following phenomenon are driven by solar energy.
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Winds
Water cycle
Production of biomass
All above
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