Question

oxidation number of C into 2CO2​

Answer 1

Answer:

Since, the overall charge on the complex is 0, the sum of oxidation states of all elements in it should be equal to 0. Hence, the oxidation state of C in CO2 is +4.

Answer 2

Answer:

2CO + O2  --------------->  2CO2

C in CO has an oxidation no. of +2.

C in CO2 has an oxidation no. of +4.

Carbon has increased in oxidation number from CO to CO2. Therefore, wesay that carbon monoxide has been oxidized to carbon dioxide. Note that we ignore the stoichiometry coefficients in the chemical equations in redox oxidation numbers calculations.