根據(jù)下列反應(yīng)構(gòu)成原電池,測得它的E〇=0.445V,已知E〇(I2/I)為0.535V,則電對S4O62-/S2O32-為()
A.-0.090V B.0.980V C.0.090V D.-0.980V
由電極反應(yīng)Cu+e-→CuE〇 (Cu2+/Cu)=+0.34V 推測電極反應(yīng)2Cu2Cu2++4e-的E〇(Cu2+/Cu)值為下列哪一項()
A.-0.68V B.+0.68V C.-0.34V D.+0.34V
A.Hg2+ B.MnO4- C.Cr2O2- D.Cl2