The oxidation state for carbon element in CO2 is:

a. + 4

b. + 5

c. + 1

d. + 3

Option A,+4

Explanation:

Oxidation state of any element is the sum of oxidation of all elements = 0

Here we need to find oxidation no of carbon and consider oxidation no of carbon as X and oxidation number of oxygen is - 2

Then X+2 (-2) = 0 (since 2 oxygen atoms are there in CO2)

X-4=0

X=+4