Consider the following half-reaction: 

PbO₂(s) → Pb²⁺(aq)

Balance the half-reaction in the basic solution.

Balance the following redox reactions in a basic solution. What is the hydroxide ion's coefficient and where does it appear in the equation?

HNO₂(aq) + Bi(s) → NO(g) + BiO⁺(aq)

Balance the following redox reaction under basic conditions and identify the oxidizing and reducing agents:
Zn(s) + BrO₃^-(aq) → Zn²⁺(aq) + Br^-(aq)