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MDCAT Chemistry Chapter 8 Thermo-chemistry and Energetics of chemical reactions Online Test MCQs With Answers
Question # 1
The electrochemical reactions occurring at both the electrodes along with the electrolytic conduction constitute
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Oxidation
reduction
Redox reaction
electrolysis
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Question # 2
The element with highest E°red
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N
F
O
CI
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Question # 3
Which of the following metal does not liberate hydrogen on reaction with acid?
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Mg
Pt
Zn
Ca
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Question # 4
Coinage metals Cu. Ag, and Au are the least reactive because they have
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Negative reduction potential
Positive reduction potential
Negative oxidation potential
Positive oxidation potential
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Question # 5
Coinage metals Cu, Ag and Au are the least reactive because they have
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Negative reduction potential
Negative oxidation potential
Positive reduction potential
Positive oxidation potential
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Question # 6
The standard electrode potential of hydrogen is arbitrarily taken at 298k is
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1.00volt
0.10 volt
0.00 volt
10.0 volt
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Question # 7
In MgCl2, the oxidation state ofCI is
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Zero
-2
+2
-1
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Question # 8
If Cl2 is passed through hot NaOH. NaCIO3 is formed and the oxidation number of CI changes from
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-1 to 0
0 to +5
0 to-1
0 to +1
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Question # 9
Geometry of NH3 is
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Tetrahedral
Square planer
Pyramidal
Linear
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Question # 10
During oxidation process, oxidation number of an element
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Decreases
Increases
Remains constant
Both a and b
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Question # 11
The products of electrolysis of which of the followings are known
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Fused electrolyte
Aqueous solution of eleetrolyte
Solid electrolyte
Solid metal
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Question # 12
The reduction potentials of non-metals are A =+0.54V, B=+1.08V, C=+1.36V. D= +2.87V Which non -metal can displace all other from aqucous solution of their salts
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A
C
B
D
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Question # 13
In which molecule. all atoms are coplanar?
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CH4
BF3
NH3
PH3
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Question # 14
Which of the following bonds is not present in NH4CL
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lonic bond
Covalent bond
Co-ordinate covalent bond
De-localized covalent bond
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Question # 15
In voltaic cell a saht bridge is used in order to
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Pass the electric current
Prevent the flow of ions
Mix solutions of two half cells
Allow movement of' ions between two cells
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Question # 16
The common oxidation number of halogens is
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-1
+1
-2
0
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Question # 17
Rusting of iron metal Fe occurs when Fe gets converted into Fe2O3 What happen with Fe?
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F'e is neutralized
Fe is sublimed
Fe is reduced
Fe is oxidized
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Question # 18
Molten lead and iead (II) bromide both conduct electricity. Which one of the following statements relating to this is true?
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Both undergo chemical change when they conduct
Both conduct by the movement of charge particles
Both will also conduct in the solid state
Both contain mobile electrons
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Question # 19
The cell which converts electrical energy to chemical energy is called
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Electrochemical cell
Voltaic cell
Galvanic cell
Down's cell
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Question # 20
The oxidation state of carbon in C2O-²4 is
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+4
-4
+3
+2
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