Electrochemistry Advanced
Q. In a galvanic cell, which electrode is the site of reduction?
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A.
Anode
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B.
Cathode
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C.
Salt bridge
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D.
Electrolyte
Solution
In a galvanic cell, reduction occurs at the cathode, where electrons are gained.
Correct Answer: B — Cathode
Q. What is the IUPAC name for the compound CH₃-CH₂-CH(CH₃)-CH₂OH?
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A.
2-Butanol
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B.
3-Pentanol
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C.
1-Butanol
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D.
2-Pentanol
Solution
The IUPAC name for CH₃-CH₂-CH(CH₃)-CH₂OH is 2-Pentanol, as the longest chain has five carbons and the hydroxyl group is on the second carbon.
Correct Answer: D — 2-Pentanol
Q. What is the main function of a salt bridge in an electrochemical cell?
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A.
To provide a source of electrons
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B.
To maintain electrical neutrality
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C.
To increase the reaction rate
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D.
To separate the electrodes
Solution
The main function of a salt bridge is to maintain electrical neutrality by allowing ions to flow between the two half-cells.
Correct Answer: B — To maintain electrical neutrality
Q. What is the primary product of the electrolysis of aqueous NaCl?
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A.
Hydrogen gas
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B.
Chlorine gas
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C.
Sodium hydroxide
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D.
Sodium chloride
Solution
During the electrolysis of aqueous NaCl, chlorine gas is produced at the anode due to the oxidation of chloride ions.
Correct Answer: B — Chlorine gas
Q. What is the standard electrode potential of the half-reaction: Cu²⁺ + 2e⁻ → Cu?
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A.
+0.34 V
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B.
+0.76 V
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C.
-0.34 V
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D.
-0.76 V
Solution
The standard electrode potential for the reduction of copper ions to copper is +0.76 V.
Correct Answer: B — +0.76 V
Q. What is the stereochemical configuration of 2-butanol?
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A.
R
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B.
S
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C.
R and S
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D.
Neither
Solution
2-Butanol has a chiral center and can exist as both R and S enantiomers.
Correct Answer: C — R and S
Q. Which biomolecule is primarily responsible for energy storage in cells?
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A.
Proteins
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B.
Nucleic acids
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C.
Carbohydrates
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D.
Lipids
Solution
Lipids, particularly triglycerides, are primarily responsible for energy storage in cells.
Correct Answer: D — Lipids
Q. Which of the following is a characteristic of electrochemical cells?
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A.
They convert chemical energy to electrical energy
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B.
They only operate in acidic solutions
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C.
They require a constant supply of reactants
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D.
They cannot be reversed
Solution
Electrochemical cells convert chemical energy into electrical energy, which is a fundamental characteristic of these systems.
Correct Answer: A — They convert chemical energy to electrical energy
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