Verified Solution • 2025–26 Session moderate

QNEET-2013-Ch-1487: NEET 2013 Chemistry - Class 12 NEET-2013-Ch-1487 Solution: A button cell used in watches function as following. \(Zn(s) +…

A button cell used in watches function as following. Zn(s)+Ag2O(s)+H2O(l)→2Ag(s)+Zn2+(aq)+2OH−(aq)Zn(s) + Ag_2O(s) + H_2O(l) \rightarrow 2Ag(s) + Zn^{2+}(aq) + 2OH^-(aq) If half cell potentials are Zn2+(aq)+2e−→Zn(s);E∘=−0.76 VZn^{2+}(aq) + 2e^- \rightarrow Zn(s); E^\circ = -0.76\ \text{V} Ag2O(s)+H2O(l)+2e−→2Ag(s)+2OH−(aq)E∘=0.34 VAg_2O(s) + H_2O(l) + 2e^- \rightarrow 2Ag(s) + 2OH^-(aq) E^\circ = 0.34\ \text{V} The cell potential will be 0.84 V 1.34 V 1.10 V 0.42 V

Multiple Choice Options

  • A 0.84 V
  • B 1.34 V
  • C 1.10 V
  • D 0.42 V

Step-by-Step Verified Solution

At anode :Zn 2+ (aq) + 2e _ _ Zn (s) ;  E o = _ 0.76 V At cathode : Ag 2 O (s) + H 2 O (l) + 2e _ _ 2Ag (s) + 2OH _ (aq), E o = 0.34 V E� cell = E� cathode � E� anode = 0.34 � (�0.76) = 1.10 V

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