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In which chemical reaction does carbon exibit variation of oxidation state from -4 to +4 ? Write balanced chemical reaction.
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In combustion of methane, carbon exhibits variation from -4 to +4. The reaction is as follows:
CH4 + 2O2 → CO2 + 2H2O
In CH4, the oxidation state of carbon is -4 while in CO2, the oxidation state of carbon is +4.

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