Which of the following half-reactions is not correct? Cu^+ + e^- rightarrow Cu M

Question

Which of the following half-reactions is not correct? Cu^+ + e^- rightarrow Cu Mg rightarrow Mg^2+ + 2e^- Fe^3+ + 2e^- rightarrow Fe^+ Pb^2+ + e^- rightarrow Pb^3+ The following reaction occurs in the alkaline battery. Zn(s) + MnO_2(s) + H_2O rightarrow ZnO(s) + Mn(OH)_2 (s) Which of the following statements is incorrect? The battery is "good" usually until the reactants are consumed. The Nernst equation predicts that the E_cell will decrease as the battery discharges. The zinc serves as the anode. A carbon rod in contact with moist MnO_2(s)/KOH paste would be the positive electrode.

Explanation / Answer

19.

D is incorrect

since it shows a loss of electron, not a gain

20.

a. sis correct, until all reactants stop recting

b. TRUE since nerst eequation show concnetration and Ecell relationsihp

c.

zing --> oxidizes it must be in the anode is true

d.

this is incorrect. avoid this electrode

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