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A hypothetical electrochemical cell is shown below: A|A+ (xM)||B+ (yM)|B The emf measured is +0.20 V. The cell reaction is A+ + e– → A; B+ + e– → B (a) The cell reaction can be predicted to be

1. A + B+ → A+ + B
2. A+ + B → A + B+
3. A + B → A+ + B+
4. A+ + B+ → A + B

Correct answer: A + B+ → A+ + B

Solution

The positive emf indicates a spontaneous reaction. Since A is oxidized (A → A+ + e–) and B+ is reduced (B+ + e– → B), the overall reaction is A + B+ → A+ + B.

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