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PPSC Chemistry Full Book Test MCQs With Answers
Question # 1
Pick out incorrect statement about K2Cr2O7
Choose an answer
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 # 2
Which of the following statements is false about transition metals.
Choose an answer
They form complexes
They show variable valency
All transition metal compounds are paramagnetic
They form coloured ions
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Question # 3
If Principal quantum number n = 4 the quantum number l can have calue.
Choose an answer
1,2,3 and 4
0,1,2 and 3
1,2 and 3 only
None of the abvoe
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Question # 4
Which ionization Potential in the following equations involves the greatest amount of energy.
Choose an answer
Na = Na+ + e
K = K+ +e
C2+ = C3+ +e
Ca+ = Ca2+ + e
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Question # 5
Lactic acid is a molecule which shows
Choose an answer
Epimersim
Tautomerism
Opical isomerism
Metamerism
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Question # 6
All cycle engines working reversibly between same temperature of source and sink have the same efficiency This is the statement for the.
Choose an answer
Carnot cycle
Carnot theorem
Narnst theorem
Second law of thermodynamics
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Question # 7
Which of the following orbitals does not make sense.
Choose an answer
6f
4f
7s
2d
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Question # 8
Which of the following compounds would you use in order to obtain a crystalline derivative of an aromatic amine.
Choose an answer
2,4 Dinitrophenyl hydrazine
Nitrous acid
Benzoyl chlride
None of these
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Question # 9
As it passes into food chain, the concentration of DDT
Choose an answer
Remains same
Decreases
Increases
Unpredictable
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Question # 10
Non localised bonds are referred as
Choose an answer
Metallic bond
Long range bonds
Ionic bond
Covalent bonds
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Question # 11
The branch of chemistry which is concerned with the interrelation of electrical and chemical energy is called.
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Reaction dynamics
Electrochemisty
Surface chemistry
Kinetics
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Question # 12
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 # 13
Which of the following is a false statement.
Choose an answer
Halogens are strong oxidizing agent
Halogens show only (-I) Oxidation state
Hf molecules from intermolecular H-Bonds
Fluorine is highly reactive
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Question # 14
The number of moles of solute dissolved in 1000 gram of the solvent is called
Choose an answer
Formality
Molality
Molarity
Mole fraction
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Question # 15
Which of the following physical property forms the basis of radio chemicals methods of analysis.
Choose an answer
Absorption of light
Emission of light
Radioactivity
Thermal conductivity
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Question # 16
The maximum number of electron is an atom with l = 2 and n = 3 is
Choose an answer
2
6
10
12
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Question # 17
The force responsible for dissolution of ionic compounds in water are
Choose an answer
Hydrogen bonds
Ion dipole forces
Ionic bonds
Van Der Waal forces
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Question # 18
Which of the following is not an acid radical
Choose an answer
Cl-
Br-
K+
I-
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Question # 19
Which of the following substances act as pollutant.
Choose an answer
Oils
Greases
Toxins
All above
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Question # 20
The electronic configuration of chromium is 4s1, 3d5, The elements tungsten (W) belongs to the same group and has atomic number 74.The configuration of its valence shell is.
Choose an answer
5s1, 4d5
6s1, 5d5
6s1, 5d6
6s1, 5d4
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Question # 21
Pick out the incorrect statement about K2Cr2O7
Choose an answer
It is thermally stable
It dissolves in alkali to form chromate
It oxidizes acidified FeSO4 solution to Fe2(SO4)3
It is used as cleansing agent for glassware. etc. When mixed with cold con. H2SO4
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Question # 22
The width of a typical DNA molecule is _______nm
Choose an answer
1
2
5
10
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Question # 23
What is the colour of pulp obtained from chemical pulping.
Choose an answer
Black
Brown
Blue
Red
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Question # 24
Egyptians were using ________ to prepare make up for eyes.
Choose an answer
Nanoaluminium
Nanocopper
Nanosteel
Nanolead
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Question # 25
Each fat or oil in made up of
Choose an answer
A distinctive mixture of several different triglycorides
A distinctive mixture of several aldehydes
Mixture of above both
None of above
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Question # 26
Which of the following dye is used an antiseptic .
Choose an answer
Methyl orange
Mercurochrome
Alizarin
Bismarck brown
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Question # 27
AI Cl3 acts as a strong Lewis acid, because it is.
Choose an answer
A covalent compound
Readily hydrolyzed
Electron deficient
An ionic compound
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Question # 28
The smog is essentially caused by the presence of.
Choose an answer
O3 and N2
O2 and N2
Oxides of sulphur and nitrogen
O2 and O3
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Question # 29
What is the oxidation number of the central meal atom in the coordination compound.[Pt(NH#)#Cl]Cl
Choose an answer
-1
0
+2
+3
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Question # 30
The one which is not a purine base
Choose an answer
Cytosine
Guanine
None of these
Adenine
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Question # 31
Which one of the following has the highest boiling point.
Choose an answer
H2O
H2S
H2Se
H2Te
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