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Redox Reactions
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14/11/2021 10:33 am
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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 /2I- = 0.536 V. The favourable redox reaction is :
(a) I2 will be reduced to I-
(b) There will be no redox reaction
(c) I- will be oxidised to I2
(d) Fe2+ will be oxidised to Fe3+
1 Answer
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14/11/2021 10:41 am
Correct answer: (c) I- will be oxidised to I2
Explanation:
Given Fe3+/Fe2+ = + 0.77 V
and I2 /2I- = 0.536V
2(e- + Fe3+ → Fe2+) E° = 0.77 V
2I- → I2 + 2e- E° = -0.536 V
2Fe3+ + 2I- → 2Fe2+ + I2
E° = E°ok + E°red
= 0.77 - 0.536
= 0.164 V
∴ Since value of E° is + ve reaction will take place.