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PPSC Chemistry Full Book Test MCQs With Answers
Question # 1
The simplest formula of a compound containing 50% of element X
Choose an answer
XY2
XY
X2Y
None of the abvoe
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Question # 2
CNG is stored under
Choose an answer
Power genertion
Electric Generators
Solvent
All of above
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Question # 3
The high oxidizing power of halogens is favored by.
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Low heat od dissociation of X2
A high electron affinity of the atom
A higher hydration energy of the ion
All of above
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Question # 4
Which of the following water require zero hardness.
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Boiler feed water
Laundry water
Paper will water
Dyeing water
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Question # 5
Electronegativity of Oygen is.
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2.5
3.5
2.4
2.1
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Question # 6
A mixture of weak acid and its salt is.
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Alkaline buffer
Acidic buffer
Neutral buffer
All of above
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Question # 7
Boric acid is added to glass because is.
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Makes the glass opalescent
Reduces the coefficient of expansion
Makes the glass brittle
Increase refractive index of the glass.
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Question # 8
The titration involving oxidation reduction reactions is called.
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Complex titration
Simplex titration
Redox titration
Acid base titration
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Question # 9
Inductive effect can be used to explain
Choose an answer
Dipole moment of chemical bonds
Strength of acids
Strength of bases
All above
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Question # 10
The first step of formation of sugar is
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Extraction
Washing
Cutting
Clarifying
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Question # 11
The following alloys are the chief alloys that are die cast except.
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Zinc alloys
Magnesium alloys
Manganese alloys
Nickel alloys
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Question # 12
Which of the following statements is wrong.
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Covenant compounds are generally soluble is polar solvents.
Covalent compounds have low melting and boiling points
Lower than that of separate H atoms
Sometimes lower and sometimes higher than that of separate H
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Question # 13
The entropy of the universe
Choose an answer
Tends towards a maximum
Tend towards a maximum
Tends to be zero
Remains constatn
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Question # 14
A high frequency sound has frequency
Choose an answer
100 Hz
200 HZ
300 Hz
500 Hz
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Question # 15
Oxytocin, a pituitary hormone to
Choose an answer
Amino acid
Polypeptide
Protein
Conjugated protein
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Question # 16
According to SHAH concept the Lewis bases were classified on the basis os.
Choose an answer
Charge ion size
Polarization consideration
Electron and co coordinating ability
All of above
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Question # 17
The pair of molecules or ions having identical geometry is.
Choose an answer
BCl3, PCl3
BF3, NH3
CHCl3, CCl4
SiCl4, CCl4
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Question # 18
Which of the following metal ion cannot be catimated by gravimetric analysis.
Choose an answer
K+
Ca
2+
Al3+
Zn2+
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Question # 19
The reagent which can be used to distinguish acetophenone from benzophenone is.
Choose an answer
2,4 -dinito phenyl hydrazine
Li AIH4
Benedict reagetn
I2 and Na2CO3
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Question # 20
Which metal can produce dihydrogen gas by reaction with dil H2SO4
Choose an answer
Ag
Fe
Cu
Pt
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Question # 21
In a system of designating wrought aluminum alloys. what does the second digit represents.
Choose an answer
The purity of aluminum
The identity of the alloy
The modification of the alloy group or impurity limits
None of above
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Question # 22
Which of the following is not a general property of amino acids.
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They have high m.p. and b.p
They are soluble in water
Their dipole moments are high
They are amorphous solids
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Question # 23
Carbohydrates are characterized by the presence of.
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Hydroxyl group
Carbony group
Asymmetric carbon
All of these
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Question # 24
Bitumen is used in
Choose an answer
Electric generators
Road surfacing
Coal tar
All of above
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Question # 25
Which of the following process is involved in nitrogen flotation
Choose an answer
Non symmetric fixation of nitrogen
Fixation by soil bacteria
Fixation by yeast
Fixation by blue green algae
All above
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Question # 26
The ionization potential of K would be numerically equal to.
Choose an answer
Electron affinity of Ar
Electromagnetically of K
Electron affinity of K+
ionization energy of Ca
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Question # 27
In second group of inorganic qualitative analysis, the S
2-
ions does not form precipitate with which of the following ions.
Choose an answer
Hg2+
Cu
2+
Ai
3+
Cd
3+
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Question # 28
Aluminum is an active metal but does not corrode as iron does because.
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Ai does not react with O2
A protective layer of Al2 O3 forms on the metal surface
AI is harder to Oxidize than is Fe
Aluminium has a high tensile strength
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Question # 29
Select the correct IUPAC name for [FeF4(OH)2]-
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Diaquatrafluoriron (III) ion
Diaquateratrafluoriferrate (III) ion
Diaquatertrafluoroiron (I)
None of these
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Question # 30
Which one of the following sets of elements has the strongest tendency to form positive ions in gaseous state.
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Li, Na, K
F, Cl, Br
Be, Mg, Ca
O, S , Se
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Question # 31
The bond order for BO molecule is.
Choose an answer
2.5
3.0
2.0
3.5
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