Identify incorrect statement about standard hydrogen electrode:
Correct answer: B. Its E°red is zero or less than zero
- A. It is used as a reference electrode
- B. Its E°red is zero or less than zero
- C. When it is connected to a zinc electrode in a galvanic cell, it acts as the cathode
- D. When it is connected to a copper electrode in a galvanic cell, it acts as an anode
Explanation
The correct answer is Option B. The standard reduction potential of the standard hydrogen electrode is defined to be exactly 0 volts. This is a convention used to provide a baseline for measuring and comparing the potentials of other electrodes.Option A is correct because the standard hydrogen electrode is indeed used as a reference electrode in electrochemical measurements. Option C is correct as in a zinc-hydrogen cell, the hydrogen electrode acts as the cathode, accepting electrons. Option D is incorrect because, when connected to a copper electrode, the hydrogen electrode serves as the anode due to copper's higher reduction potential.
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Electrochemistry describes electron transfer through oxidation and reduction, identifies oxidizing and reducing agents, and applies oxidation numbers to balance redox equations. It also covers electrode potential and the standard hydrogen electrode, which provides the reference for comparing the reduction tendencies of other electrodes.
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