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In methane, CH4, the oxidation number of carbon is -4 and that of each hydrogen is +1, as carbon is slightly more electronegative than hydrogen.

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Q: When does carbon have a negative 4 oxidation number?
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What is the oxidation number of carbon in CH3OH?

The oxidation state of carbon in CH3OH is 4


What is the oxidation number of carbon in carbonic acid?

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What is the oxidation number of carbon in carbonate?

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