Question

Point out the oxidation number of C in the following : 

CH₄, C₃H₈, C₂H₆, C₄H₁₀, CO, CO₂ and HCO₃ ^-, CO₃^2-

Answer 1

CH₄ : -4 ;   C₃H₈: -8/3     C₂H₆:-3;    C₄H₁₀: - 10/4

CO : + 2 ;    CO₂ : + 4 ;     HCO₃^- : + 4    CO₃^2- : +4