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Problem: What is the oxidation number of Cl in Ba(ClO 2)2?

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We’re being asked to determine the oxidation state of chlorine in Ba(ClO2)2.


The rules for oxidation states (O.S.) are as follows:

A. General Rules:

1. For an atom in its elemental form (Zn, Cl2, C(graphite), etc.)    O.S. = 0

2. For an ion (Li+, Al3+, etc.)                                                       O.S. = charge


B. Specific Rules:

1. Group 1A            O.S. = +1

2. Group 2A            O.S. = +2

3. Hydrogen            O.S. = +1, with nonmetals

 O.S. = –1 with metals and boron

4. Fluorine               O.S. = –1

5. Oxygen               O.S. = –1 in peroxides (X2O2, X = Group 1A)

 O.S. = –1/2 in superoxides (XO2, X = Group 1A)

 O.S. = –2 in other compounds

6. Group 7A            O.S. = –1 (except when bonded to O)


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Problem Details

What is the oxidation number of Cl in Ba(ClO 2)2?

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