Calculate the increase or decrease in the oxidation state for each element listed as it changes from a reactant to a product. Use a negative sign to show a decrease in oxidation state.

sulfur, beginning in the reactant $ZnS$

sulfur, beginning in the reactant $H_{2}S$

chromium, beginning in the reactant $C{r}_2{O}_3$

oxygen, beginning in the reactant $N{a}_2{O}_2$

Study the chemical equations in the table.

$\backslash$table$[[\backslash$table$[[$Equation$],[$Number$]],$Balanced Equation$],[1,2ZnS(s)+3O_2(g)longrightarrow2$ZnO$(s)+2S{O}_2(g)$