Oxidation number of carbon in `C_3O_2, Mg_2C_3` are respectively:

Options

A. `- 4//3, +4//3`
B. `+ 4//3 , -4//3`
C. `-2//3 , +2//3`
D. `-2//3 , +4//3`

Answer

B

Explanation

Carbon has negative oxidation no. in `Mg_2 C_3` and positive oxidation number in `C_3 O_2 O` is more electronegative than C. Mg is more electropositive than C.
` C_3 O_2 : 3 xx a +2(-2) =0 , a = +4/3`
` Mg_2 C_3 : 2xx 2 +3 xx a =0, a = -4/3 `