The chemical equation for the reaction between NH4Cl, CaCl2, Ca$OH$2, Fe$OH$2, FeCl2, and FeO is:

2NH4Cl + 3CaCl2 + 2Ca$OH$2 + Fe$OH$2 + 6FeCl2 + 6FeO

This reaction involves the formation of Ammonium chloride, Calcium chloride, Calcium hydroxide, Iron$II$ hydroxide, Iron$II$ chloride, and Iron$II$ oxide.