Use the standard reduction potential table to predict which reaction will occur spontaneously.

For choice A, Fe³⁺ is reduced to Fe²⁺ (E° = +0.77 V), while I⁻ is oxidized to I₂, the reverse of the I₂ reduction reaction (E° = +0.54 V). Thus E°cell = 0.77 − 0.54 = +0.23 V, so the reaction is spontaneous. The other choices have negative cell potentials as written, so they are not spontaneous under standard conditions.

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