Q. In a redox reaction, what happens to the reducing agent?
-
A.
It gains electrons
-
B.
It loses electrons
-
C.
It is oxidized
-
D.
Both B and C
Solution
The reducing agent loses electrons and is oxidized in a redox reaction.
Correct Answer:
D
— Both B and C
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Q. In electrolysis, what is produced at the anode when NaCl solution is electrolyzed?
-
A.
Hydrogen gas
-
B.
Chlorine gas
-
C.
Sodium hydroxide
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D.
Sodium metal
Solution
Chlorine gas is produced at the anode during the electrolysis of NaCl solution.
Correct Answer:
B
— Chlorine gas
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Q. What is the effect of increasing temperature on the cell potential of a galvanic cell?
-
A.
Increases cell potential
-
B.
Decreases cell potential
-
C.
No effect
-
D.
Depends on the reaction
Solution
The effect of temperature on cell potential depends on the specific reaction and its enthalpy change.
Correct Answer:
D
— Depends on the reaction
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Q. What is the Nernst equation used for?
-
A.
Calculating pH
-
B.
Determining cell potential under non-standard conditions
-
C.
Finding molarity
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D.
Balancing redox reactions
Solution
The Nernst equation is used to calculate the cell potential of an electrochemical cell under non-standard conditions.
Correct Answer:
B
— Determining cell potential under non-standard conditions
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Q. What is the primary function of a salt bridge in an electrochemical cell?
-
A.
To provide a pathway for electrons
-
B.
To maintain charge balance
-
C.
To increase conductivity
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D.
To prevent gas evolution
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 standard electrode potential of the half-reaction Ag^+ + e^- → Ag?
-
A.
0.80 V
-
B.
0.34 V
-
C.
0.76 V
-
D.
0.50 V
Solution
The standard electrode potential for the reduction of silver ions to silver is +0.80 V.
Correct Answer:
A
— 0.80 V
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Q. Which of the following is a characteristic of a primary battery?
-
A.
Rechargeable
-
B.
Single-use
-
C.
Higher energy density
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D.
Lower cost
Solution
Primary batteries are designed for single-use and cannot be recharged.
Correct Answer:
B
— Single-use
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Q. Which of the following is a strong oxidizing agent?
-
A.
Fe^3+
-
B.
Cu^2+
-
C.
Ag^+
-
D.
MnO4^-
Solution
Permanganate ion (MnO4^-) is a strong oxidizing agent commonly used in redox reactions.
Correct Answer:
D
— MnO4^-
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Q. Which of the following metals can be used as an anode in a galvanic cell?
-
A.
Copper
-
B.
Gold
-
C.
Zinc
-
D.
Platinum
Solution
Zinc is commonly used as an anode in galvanic cells due to its higher reactivity compared to copper and gold.
Correct Answer:
C
— Zinc
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Q. Which of the following statements about galvanic cells is true?
-
A.
They require an external power source
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B.
They convert chemical energy to electrical energy
-
C.
They operate at high temperatures
-
D.
They are always spontaneous
Solution
Galvanic cells convert chemical energy into electrical energy through spontaneous redox reactions.
Correct Answer:
B
— They convert chemical energy to electrical energy
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