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MDCAT Chemistry Chapter 8 Thermo-chemistry and Energetics of chemical reactions Online Test MCQs With Answers
Question # 1
The electrochemical series is based on
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pH scale
Redox scale
Hdrogen scale
Arrhenius scale
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Question # 2
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 # 3
The common oxidation number of halogens is
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-1
+1
-2
0
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Question # 4
During the electrolysis of Fused NaCI, the products are
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Na and H2
Na and Cl2
Na and O2
H2 and Cl2
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Question # 5
The element with highest E°red
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N
F
O
CI
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Question # 6
The potential of SHE is taken as zero which is avalue
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Reference
Arbitrary
Exact
Experimental
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Question # 7
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 # 8
The electrolyte used in fuel cell is
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КOH
NaCl(aq)
NaNO3
Molten NaCl
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Question # 9
By the electrolysis of CuCl2 using inert electrodes of platinum which species is deposited at cathode
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H2
O2
Cu
CI
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Question # 10
Zinc reacts with dilute acids to liberate hydrogen. This is because:
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Zn2+ ion is a powertul osidising agent than H' ion
H+ ion is a powerful oxidising agent than Zn ion
Zn2+ ion is a powerful reducing agent than H' ion
H+' ion is a powerful reducing agent than Zn- ian
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Question # 11
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 # 12
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 # 13
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 # 14
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 # 15
Most reactive among the following
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Li
Mg
Ca
Na
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Question # 16
If a salt bridge is removed from two half cells the emf is
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Increased
Decreased
Dropped to zero
Electrodes will be reversed
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Question # 17
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 # 18
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 # 19
In all oxidation reactions, atoms of an element in a chemical species lose electrons and increases their
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Oxidation states
Reduction states
Electrode
Negative charges
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Question # 20
Which one of the following metals can replace the Copper from aqueous solution of its salt more easily?
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Cd
Fe
Zn
Na
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