Question

which element is oxidized in this reaction? fe₂o₃ + 3co→2fe + 3co₂ enter the chemical symbol of the element. view available hint(s) is oxidized submit part b complete previous part(s) part c which element is reduced in this reaction? 16h⁺ + 2cr₂o₇²⁻ + c₂h₅oh→4cr³⁺ + 11h₂o + 2co₂ enter the chemical symbol of the element. view available hint(s) is reduced submit

Explanation:

Step1: Determine oxidation - states in first reaction

In $Fe_2O_3$, Fe has an oxidation - state of +3 and in Fe it is 0. In CO, C has an oxidation - state of +2 and in $CO_2$ it is +4. Oxidation is an increase in oxidation - state. C goes from +2 in CO to +4 in $CO_2$.

Step2: Determine oxidation - states in second reaction

In $Cr_2O_7^{2 - }$, Cr has an oxidation - state of +6 and in $Cr^{3+}$ it is +3. In $C_2H_5OH$, C has an average oxidation - state of -2 and in $CO_2$ it is +4. Reduction is a decrease in oxidation - state. Cr goes from +6 in $Cr_2O_7^{2 - }$ to +3 in $Cr^{3+}$.

Answer:

Part A: C
Part C: Cr