A

\[\ce{4P + 5O2 -> 2P2O5}\]

B

\[\ce{CaO + H2O -> Ca(OH)2}\]

C

\[\ce{2NaNO3 -> 2NaNO2 + O2}\]

D

\[\ce{Fe + H2SO4 -> FeSO4 + H2}\]

E

\[\ce{3NH3 + 4H2SO4 -> 3HNO3 + 7H2O + 4S}\]