Depict what kind of redox reaction each reaction below is. Identify the oxidizing and reducing agents.
A) 2 Ca(s) + O2(g) ---> 2 CaO(s)
B) 2 Al(s) + 6 HCl(aq)---> 3 H2(g) +2AlCl3(aq)
C) 2 HgO(s)--->2 Hg(l) + O2(g)
D) C2H4(g) + 3 O2(g)---> 2 Co2(g) + 2 H2O(l)
E) Si(s) + 2 Cl2(g) --->SiCl4(g)