Chapter 2, Problem 25SAE

Identify each of the following reactions as a synthesis, decomposition, or exchange reaction:

$2\text{Hg}+{\text{O}}_2\to 2\text{HgO}$

${\text{Fe}}^{2+}+{\text{CuSO}}_4\to {\text{FeSO}}_4+{\text{Cu}}^{2+}$

$\text{HCl}+\text{NaOH}\to \text{NaCl}+{\text{H}}_2\text{O}$

${\text{HNO}}_3\to {\text{H}}^{+}+{\text{NO}}_3^{-}$