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For an electrochemical cell, consider these expressions for the cell emf: (i) emf = oxidation potential of the anode − reduction potential of the cathode (ii) emf = oxidation potential of the anode + reduction potential of the cathode (iii) emf = reduction potential of the anode + reduction potential of the cathode (iv) emf = oxidation potential of the anode − oxidation potential of the cathode Which of these relations are valid?

1. (ii) and (iv)
2. (iii) and (i)
3. (i) and (ii)
4. (iii) and (iv)

Correct answer: (ii) and (iv)

Solution

The correct options are valid because the cell emf is calculated by adding the oxidation potential of the anode to the reduction potential of the cathode, which aligns with option (ii). Additionally, option (iv) correctly states that the emf can also be expressed as the difference between the oxidation potentials of the anode and cathode.

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