Question

Consider the following reactions:

(i) $C_2{O}_4^{2-}\to C{O}_2$

(ii) $S{O}_4^{2-}\to S{O}_3^{2-}$

(iii) $Mn{O}_4^{2-}\to Mn{O}_4^{-}$

(iv) $F{e}^{3+}\to F{e}^{2+}$

Choose the correct answer: -

• A. $\left(i\right)\&(ii)$ shows oxidation
• B. $\left(iii\right)\&\left(iv\right)$ shows reduction
• C. $\left(i\right)\&\left(iii\right)$ shows oxidation
• D. $\left(iii\right)\&\left(iv\right)$ shows oxidation

Answer 1

Answer: (C)

In $C_2{O}_4^{2-}\to C{O}_2$ oxidation number of carbon change from $+3$ $to+4$ .

In $S{O}_4^{2-}\to S{O}_3^{2-}$ oxidation number of sulphur change from $+6to+4$ .

In $Mn{O}_4^{2-}\to Mn{O}_4^{-}$ oxidation number of Mn change from $+6to+7$ .

In $F{e}^{3+}\to F{e}^{2+}$ oxidation number of carbon change from +3 to +2.