Question detail
Which of the following correctly represents an electrochemical cell diagram (A-level cue 4b01023e focus)
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Electrode potentials and electrochemical cells (A-level only)
Question
- A. Zn | Zn²⁺ || Cu²⁺ | Cu
- B. Cu | Cu²⁺ || Zn²⁺ | Zn (A-level cue 4b01023e distractor 1)
- C. Zn²⁺ | Zn || Cu | Cu²⁺ (A-level cue 4b01023e distractor 2)
- D. Cu²⁺ | Cu || Zn | Zn²⁺ (A-level cue 4b01023e distractor 3)
Answer
Zn | Zn²⁺ || Cu²⁺ | Cu
Explanation
The correct option is Zn | Zn²⁺ || Cu²⁺ | Cu. Zn | Zn²⁺ || Cu²⁺ | Cu is correct because it supports the objective: Required practical: measure the EMF of an electrochemical cell.. The reasoning stays within Standard electrode potentials (A-level only) and avoids drifting into a similar A-Level Chemistry idea. This version is uniquely anchored to Standard electrode potentials (A-level only). Retrieval anchor: A-level cue 4b01023e.
Common mistake
Measuring EMF of Electrochemical Cells
Students often forget to account for the correct polarity when measuring the EMF of an electrochemical cell, leading to incorrect potential values.
To fix this, remember to connect the positive terminal of the voltmeter to the more positive electrode and the negative terminal to the more negative electrode. Use the formula for EMF: EMF = E(cathode) - E(anode). Substitute the standard electrode potentials for the cathode and anode, calculate the difference, and ensure the final answer is expressed in volts (V). Keep the correction anchored to Standard electrode potentials (A-level only) and the objective: Required practical: measure the EMF of an electrochemical cell.
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