Question

Balance the following equations for a half reaction that occurs in a acidic solution

A) ClO3- --> Cl2
B)H2BO3- -->BH4-
C) MnO4- + HNO2 -->NO3- +Mn2+

Answer 1

You need to learn to do these yourself. Here is a site that gives you almost anything you want to know about redox equation. Ask specific equations if you still need help.
http://www.chemteam.info/Redox/Redox.html