Which of the Following is NOT an Example of a Reduced

Question

Which of the following is NOT an example of a reduced form of carbon in the carbon cycle?
A) methane
B) biomass
C) hydrocarbons
D) carbon dioxide
E) methanol

Accepted Answer

Carbon dioxide is considered an oxidized form of carbon, not a reduced form. Methane, biomass, hydrocarbons, and methanol all contain carbon in a more reduced state, where it is bonded to hydrogen or itself, rather than being fully oxidized as in CO2.