ANSWER
The oxidation number of chlorine in KClO3 is +5
EXPLANATION
Category --------- General Chemistry
Sub-category ------- Electrochemistry
The given compound is KClO3
Follow the steps below to find the oxidation number of chlorine
Let x represents the oxidation number of chlorine
Recall, the oxidation number of chlorine is +1 and the oxidation number of oxygen is -2
Hence, we have
[tex]\begin{gathered} \text{ +1 + x + 3\lparen-2\rparen = 0} \\ \text{ + 1 + x - 6 = 0} \\ \text{ collect the like terms} \\ \text{ +1 - 6 + x = 0} \\ \text{ -5 + x = 0} \\ \text{ x = 0 + 5} \\ \text{ x = 5} \end{gathered}[/tex]Therefore, the oxidation number of chlorine in KClO3 is +5
