Cell potential

2013 NEET 1 question

1. 1 Electrochemistry
   A button cell used in watches functions as following: $Zn(s) + Ag_2O(s) + H_2O(l) \rightleftharpoons 2Ag(s) + Zn^{2+}(aq) + 2OH^-(aq)$. If half cell potentials are $Zn^{2+}(aq) + 2e^- \rightarrow Zn(s)$; $E^\circ = -0.76$ V and $Ag_2O(s) + H_2O(l) + 2e^- \rightarrow 2Ag(s) + 2OH^-(aq)$; $E^\circ = 0.34$ V, the cell potential will be:
   A 1.34 V B 1.10 V C 0.42 V D 0.84 V
   Check Answer