Complete the following equation:

$4\mathrm{Fe} + 3{\mathrm{O}}_2 + {\mathrm{H}}_2\mathrm{O}\to$$2$ .

$\mathrm{A}$: ${\mathrm{O}}_2$

$\mathrm{B}$: ${\mathrm{Fe}}_3{\mathrm{O}}_4$

$\mathrm{C}$: $\mathrm{FeO}$

$\mathrm{D}$: ${\mathrm{Fe}}_2{\mathrm{O}}_3.{\mathrm{H}}_2\mathrm{O}$

Enter your correct answer as $\mathrm{A}, \mathrm{B}, \mathrm{C} \mathrm{or} \mathrm{D}$.

Complete the following equation:

$2\mathrm{Cu} + {\mathrm{H}}_2\mathrm{O} + {\mathrm{CO}}_2 + {\mathrm{O}}_2\to \mathrm{Cu}(\mathrm{OH}{)}_2 +$ _____

(A) ${\mathrm{CuCO}}_3$                     (B) $\mathrm{CuO}$                       (C)${\mathrm{H}}_2{\mathrm{CO}}_3$

Enter your correct answer as A, B or C.

Complete the following equations:

$\mathrm{A}$: ${\mathrm{Al}}_2{\mathrm{O}}_3$

$\mathrm{B}$: ${\mathrm{Fe}}_3{\mathrm{O}}_4$

$\mathrm{C}$: ${\mathrm{Al}}_2{\left({\mathrm{SO}}_4\right)}_3$

Enter your correct answer as $\mathrm{A}, \mathrm{B},$ or $\mathrm{C}$.