Q. In a concentration cell, the cell potential is dependent on:
-
A.
Temperature only
-
B.
Concentration differences
-
C.
Electrode material
-
D.
Surface area of electrodes
Solution
In a concentration cell, the cell potential is dependent on the concentration differences of the reactants.
Correct Answer:
B
— Concentration differences
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Q. In a concentration cell, the cell potential is generated due to:
-
A.
Different temperatures
-
B.
Different concentrations
-
C.
Different pressures
-
D.
Different electrode materials
Solution
In a concentration cell, the cell potential is generated due to differences in ion concentrations.
Correct Answer:
B
— Different concentrations
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Q. In electrochemical cells, what is the role of the cathode?
-
A.
Site of oxidation
-
B.
Site of reduction
-
C.
Source of electrons
-
D.
None of the above
Solution
The cathode is the site of reduction in electrochemical cells.
Correct Answer:
B
— Site of reduction
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Q. In electrochemistry, what does the term 'Faradaic current' refer to?
-
A.
Current due to capacitive effects
-
B.
Current due to non-Faradaic processes
-
C.
Current associated with redox reactions
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D.
Current due to thermal effects
Solution
Faradaic current refers to the current associated with redox reactions occurring at the electrode surface.
Correct Answer:
C
— Current associated with redox reactions
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Q. What does the term 'overpotential' refer to in electrochemistry?
-
A.
The potential difference required to drive a reaction
-
B.
The maximum potential of a cell
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C.
The potential at which equilibrium is reached
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D.
The energy lost as heat
Solution
Overpotential refers to the extra potential required to drive an electrochemical reaction beyond its equilibrium potential.
Correct Answer:
A
— The potential difference required to drive a reaction
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Q. What is the primary function of a salt bridge in an electrochemical cell?
-
A.
To provide a source of electrons
-
B.
To maintain charge balance
-
C.
To increase conductivity
-
D.
To facilitate ion exchange
Solution
The primary function of a salt bridge is to maintain charge balance by allowing ions to flow between the half-cells.
Correct Answer:
B
— To maintain charge balance
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Q. Which of the following is a primary factor affecting the rate of an electrochemical reaction?
-
A.
Temperature
-
B.
Pressure
-
C.
Concentration
-
D.
All of the above
Solution
All of the above factors—temperature, pressure, and concentration—affect the rate of an electrochemical reaction.
Correct Answer:
D
— All of the above
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