Q. In electrolysis, what occurs at the cathode?
-
A.
Oxidation
-
B.
Reduction
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C.
Neutralization
-
D.
Decomposition
Solution
In electrolysis, reduction occurs at the cathode as electrons are gained.
Correct Answer:
B
— Reduction
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Q. What does a positive cell potential indicate?
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A.
Spontaneous reaction
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B.
Non-spontaneous reaction
-
C.
Equilibrium
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D.
No reaction
Solution
A positive cell potential indicates that the reaction is spontaneous under standard conditions.
Correct Answer:
A
— Spontaneous reaction
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Q. What is Faraday's law of electrolysis?
-
A.
Mass is conserved
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B.
Charge is conserved
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C.
Current is proportional to voltage
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D.
The amount of substance deposited is proportional to the charge passed
Solution
Faraday's law states that the amount of substance deposited is proportional to the charge passed through the electrolyte.
Correct Answer:
D
— The amount of substance deposited is proportional to the charge passed
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Q. What is the purpose of a salt bridge in an electrochemical cell?
-
A.
To connect electrodes
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B.
To maintain charge balance
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C.
To increase voltage
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D.
To decrease resistance
Solution
The salt bridge maintains charge balance by allowing ions to flow between the two half-cells.
Correct Answer:
B
— To maintain charge balance
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Q. What is the unit of Faraday's constant?
-
A.
C/mol
-
B.
J/mol
-
C.
V
-
D.
A
Solution
Faraday's constant is expressed in coulombs per mole (C/mol).
Correct Answer:
A
— C/mol
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