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