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A solution contains Fe2+, Fe3+ and I- ions. This solution was treated with iodine at 35°C. E° for Fe3+/Fe2+ is +0.77 V and E° for I2/I- = 0.536 V. The favourable redox reaction is :

1. I2 will be reduced to I-
2. There will be no redox reaction
3. I- will be oxidised to I2
4. Fe2+ will be oxidised to Fe3+

Correct answer: I- will be oxidised to I2

Solution

The standard reduction potential of Fe3+/Fe2+ (+0.77 V) is higher than that of I2/I- (+0.536 V). This means Fe3+ is a stronger oxidizing agent than I2, and I- will be oxidized to I2 by Fe3+.

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