Final answer:
The reaction between HCl(g) and NH3(g) forming NH4Cl(s) is an acid-base reaction, not an oxidation-reduction reaction, as there is no change in the oxidation states of the elements.
Step-by-step explanation:
The student has asked about the oxidation-reduction reaction between HCl(g), NH3(g), and NH4Cl(s). However, the reaction described is not actually an oxidation-reduction reaction, but rather an acid-base reaction. Specifically, it describes the formation of ammonium chloride (NH4Cl) when hydrogen chloride gas (HCl) reacts with ammonia gas (NH3).
The reaction can be written as follows:
NH3(g) + HCl(g) → NH4Cl(s)
This reaction involves a proton transfer from the acid (HCl) to the base (NH3), producing the salt NH4Cl as a solid. It is important to note that this is not considered a redox reaction because there is no change in the oxidation state of the elements involved.