We’re being asked to determine theoxidation state of carboninCO32– (carbonate ion).

You are watching: What is the oxidation state of carbon in co32−?

The rules because that oxidation claims are as follows:

A. General Rules:

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

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

B. Specific Rules:

1. Team 1A O.S. = +1

2. Group 2A O.S. = +2

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

O.S. = –1 with metals and boron

4. Fluorine O.S. = –1

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

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

O.S. = –2 in various other compounds

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

Since CO32– is neithera peroxide or superoxide,the oxidation state of each oxygen atom is –2.


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What is the oxidation state the the carbon atom in the lead carbonate ion, CO32-?


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