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Electrochemistry question

2006 · Q98
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Electrochemistry question

2006 · Q98

NEETChemistryElectrochemistryMCQ+4 / −1
EoFe2+/Fe = −-− 0.441 V and EoFe3+/Fe2+ = 0.771 V, the standard EMF of the reaction Fe + 2Fe3+ →\to→ 3Fe2+ will be
  1. A
    0.111 V
  2. B
    0.330 V
  3. C
    1.653 V
  4. D
    1.212 V
View written solutionFree

Correct answer: D

At anode : Fe →\to→ Fe2+ + 2e-; Eo = -0.441 V

At cathode : Fe3+ + e– →\to→ Fe2+; Eo = 0.771 V

Fe + 2Fe3+ →\to→ 3Fe2+; Eo = ?



To get the above equation, (ii) × 2 – (i)

2Fe3+ + 2e– →\to→ 2Fe2+; Eo = 0.771 V

Fe →\to→ Fe2+ + 2e-; Eo = - 0.441 V
------------------------------------------------
Fe + 2Fe3+ →\to→ 3Fe2+

Eo = 0.771 + 0.441 = 1.212 V

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