Calculate the oxidation number of carbon ( C ) in H2C2O4 .
let us consider the oxidation number of carbon to be x.
also, we know that the oxidation number of hydrogen be +1 and Oxygen be -2.
(+1) × 2 + ( x ) × 2 + ( -2 ) × 4 = 0
+2 + 2x – 8 = 0
2x = + 6
x = + 3
Hence, the oxidation state of C in H2C2O4 is +3.