20. The standard potential for the reaction Zn + + 2Ag is 1.56 V. Given that the standard reduction potential for Ag+ + e → Ag is 0.80 V, determine the standard reduction potential for → Zn.
(A) 0.76 V ;
(B) 0.04 V ;
(C) -0.38 V ;
(D) –0.04 V;
(E) –0.76 V

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