What is the oxidation number of carbon in CO₃2-?

Name: What is the oxidation number of carbon in CO₃2-?
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Question

Quizplus · Accepted Answer

The oxidation number of oxygen is -2 in CO₃²⁻, and since the molecule has a negative charge (due to the presence of two extra electrons), the sum of oxidation numbers must be equal to -2. Therefore,
2*(-2) + x = -2 
where x is the oxidation number of carbon. Solving for x, we get:
x = +4.

What Is the Oxidation Number of Carbon in CO₃2-