Which of the below reactions are decomposition reactions? (select all that apply) a. 2KClO3 (s) → 2KCl (s) + 3O2 (g)


b. 2S (s) + 3O2 (g) → 2SO3 (g)


c. Zn (s) + 2HCl (aq) → ZnCl 2 (aq) + H2 (g)


d. 2HgO (s) → 2Hg (l) + O2 (g)