Question

What must be added to the following half-reaction for it to be balanced?
Zn --> ZN^2+




a. 2 electron to the left side
b. 2 electron to the right side
c. 3 electrons to the left side
d. 3 electrons to the right side
e. 2 electrons to both sides

Answer 1

b. 2 electrons to the right side

Balanced half-reaction: Zn → Zn^2+ + 2 e^− (Zn is oxidized, losing two electrons so charges balance).