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Electrochemistry question

2013 · Q88
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Electrochemistry question

2013 · Q88

NEETChemistryElectrochemistryMCQ+4 / −1
A button cell used in watches function as following.
Zn(s) + Ag2O(s) + H2O(l) ⇌\rightleftharpoons⇌ 2Ag(s) + Zn2+(aq) + 2OH−-−(aq)

If half cell potentials are
Zn2+(aq) + 2e−-− →\to→ Zn(s);  Eo = −-−0.76 V
Ag2O(s) + H2O(l) + 2e−-− →\to→ 2Ag(s) + 2OH−-−(aq), Eo = 0.34 V

The cell potential will be
  1. A
    0.84 V
  2. B
    1.34 V
  3. C
    1.10 V
  4. D
    0.42 V
View written solutionFree

Correct answer: C

At anode :Zn2+(aq) + 2e−-− →\to→ Zn(s);  Eo = −-−0.76 V

At cathode : Ag2O(s) + H2O(l) + 2e−-− →\to→ 2Ag(s) + 2OH−-−(aq), Eo = 0.34 V

E°cell = E°cathode – E°anode

= 0.34 – (–0.76) = 1.10 V

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