The button cell used in watches function as followsZn(s) + Ag2O(s) + H – InterviewSolution

InterviewSolution

1.

The button cell used in watches function as followsZn(s) + Ag2O(s) + H2O(l) ⇌ 2Ag(s) + Zn(aq)2+ + 2OH-(aq) the half cell potentials are Ag2O(s) + H2O(l) + 2e- → 2Ag(s) + 2OH-(aq) E° = 034VThe cell potential will be (a) 0.84V (b) 1.34V (c) 1.10V (d) 0.42V

Answer»

(c) 1.10V

Anodic oxidation: (Reverse the given reaction)

(E_ox⁰) = 0.76V cathodic reduction

E_cell⁰ = (E_ox⁰) + (E⁰_red) = 0.76 + 0.34 = 1.1V

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A button cell used in watches functions as following.Zn(s) + Ag2O(s) + H2O(l) → 2Ag(s) + Zn2+(aq) + 2OH(aq).If half cell potentials are Zn2+(aq) + 2e- → Zn(s) E° = – O.76VAg2O(s) + H2O(l) + 2e- 2Ag(s) + 2OH-(aq) E0 = 0.34VThe cell potential will be ……….. (a) 1.10V (b) 0.42V (c) 0.84V (d) 1.34V