What is the oxidation state of chlorine in potassium perchlorate, KClO4?
A)-7
B)-3
C)0
D)3
E)7

Question

Quizplus · Accepted Answer

Begin this problem by considering the oxidation state of oxygen. As in most oxides, oxygen has an oxidation state of -2. Multiply this value by four to account for all of the oxygens, giving a total oxidation value of -8. Potassium has an oxidation state of +1, bringing the total oxidation value to -7. In order to maintain electrical neutrality, chlorine must have an oxidation state of +7.

What Is the Oxidation State of Chlorine in Potassium Perchlorate