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Electrochemistry question

2011 · Q65
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Electrochemistry question

2011 · Q65

NEETChemistryElectrochemistryMCQ+4 / −1
A solution contains Fe2+, Fe3+ and I−-− ions. This solution was treated with iodine at 35oC. Eo for Fe3+/Fe2+ is + 0.77 V and Eo for I2/2I−-− = 0.536 V.
The favourable redox reaction is
  1. A
    I2 will be reduced to I−-−
  2. B
    there will be no redox reaction
  3. C
    I−-− will be oxidised to I2
  4. D
    Fe2+ will be oxidised to Fe3+
View written solutionFree

Correct answer: C

Since the reduction potential of Fe3+/Fe2+ is greater than that of I2 /I– , Fe3+ will be reduced and I– will be oxidised.

2Fe3+ + 2I– →\to→ 2Fe2+ + I2

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