Redox reaction problem?

Question

Identify oxidizing agent, reducing agent, the substance being oxidized, and the substance being reduced. Explain.

a) HCl (g) + NH3 (g) ---> NH4Cl (s)

b) SiCl4 (l) + 2 H2O (l) ---> 4 HCl (aq) + SiO2 (s)

Thank you!

Answer 1

These are not oxidation=reduction reactions. There are no oxidizing nor reducing agents. The key is that there is no change in oxidation number for any element.