Chapter 4, Problem 42QP

For the complete redox reactions given here, write the halt-reactions and identify the oxidizing and reducing agents:

$\begin{array}{l}\text{(a)}\\ {\text{4Fe+3O}}_{\text{2}}\underset{}{\to }{\text{2Fe}}_{\text{2}}{\text{O}}_{\text{3}}\\ \text{(b)}\\ {\text{Cl}}_{\text{2}}\text{+2NaBr}\underset{}{\to }{\text{2NaCl+Br}}_{\text{2}}\\ \text{(c)}\\ {\text{Si+2F}}_{\text{2}}\underset{}{\to }{\text{SiF}}_{\text{4}}\\ \text{(d)}\\ {\text{H}}_{\text{2}}{\text{+Cl}}_{\text{2}}\underset{}{\to }\text{2HCl}\end{array}$