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Electrochemistry question

2011 · Q95
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Electrochemistry question

2011 · Q95

NEETChemistryElectrochemistryMCQ+4 / −1
The electrode potentials for Cu2+(aq) + e−-− →\to→ Cu+(aq)
and Cu+(aq) + e−-− →\to→ Cu(s) are + 0.15 V and + 0.50 V respectively.

The value of Eocu2+/cu will be
  1. A
    0.500 V
  2. B
    0.325 V
  3. C
    0.650 V
  4. D
    0.150 V
View written solutionFree

Correct answer: B

Cu2+(aq) + e−-− →\to→ Cu+(aq) ; E1o = 0.15 V

Cu+(aq) + e−-− →\to→ Cu(s) ; E2o = 0.50 V

Cu2+ + 2e– →\to→ Cu ; Eo = ?

Δ\Delta ΔGo = Δ\Delta ΔG1° + Δ\Delta ΔG2°

⇒\Rightarrow⇒ – nFE° = – n1FE1° – n2FE2°

⇒\Rightarrow⇒ Eo = 1×0.15+1×0.502{{1 \times 0.15 + 1 \times 0.50} \over 2}21×0.15+1×0.50​ = 0.325 V

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