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Ecell = Ecathode − Eanode. Ecell = Ered(cathode) + Eoxi(anode). Ecell = −Eoxi(cathode) + Eoxi(anode). Hence, option (a) is correct.

1. Ecell = Ecathode − Eanode
2. Ecell = Eanode − Ecathode
3. Ecell = Ered(cathode) − Eoxi(anode)
4. Ecell = Eoxi(cathode) − Ered(anode)

Correct answer: Ecell = Ecathode − Eanode

Solution

The correct formula for the cell potential is Ecell = Ecathode − Eanode, where Ecathode is the reduction potential of the cathode and Eanode is the reduction potential of the anode. This is derived from the standard electrochemical convention.

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