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SAT Chemistry

Category - Multiple Choice

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What is the oxidation state of chlorine in potassium perchlorate, KClO₄?

-7
-3
0
3
7

Explanation

Answer: 7

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.

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