What is the oxidation number of carbon in fumaric acid, C4H4O4? A. Zero B. +1 C. +2 D. -1 E. -2
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What is the oxidation number of carbon in the following compounds? a. CO b. $C O_{2}$ c. $\mathrm{CH}_{4}$ d. $C C 1$ e. $\mathrm{CH}_{2} \mathrm{~F}_{2}$
Oxidation number of carbon in carbon suboxide is $(1)+\frac{2}{3}$ (2) $+\frac{4}{3}$ $(3)+4 \quad$ (4) $-\frac{4}{3}$ Hint: $\mathrm{C}_{3} \mathrm{O}_{2}$ is carbon suboxide. $3 \mathrm{a}-(2 \times 2)=0$ or $a=+4 / 3$
The oxidation number of carbon in $\mathrm{CH}_{2} \mathrm{O}$ is (a) $-2$ (b) $+2$ (c) 0 (d) $+4$
Redox Reactions
Topic 2 : Oxidation Number
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