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In a small container, we put Zinc powder, Ammonium Chloride, and Ammonium nitrate. In that solution, i poured some water in it, and suddenly, it caught fire.

Ammonium Nitrate acts as an oxidizer to the reaction. Ammonium Chloride merely provides Cl- as a catalyst to the reaction. The water that were poured decomposes the Ammonium Nitrate, which produces Nitrous Oxide and water vapor. The water vapor decomposes more Ammonium Nitrate, creating an autocatalyitic effect. The heat provided from the decomposition ignites the zinc, creating more heat, which decomposes the Ammonium Nitrate at a faster rate, producing more gas more rapidly.
Zinc is acting as reducing agent. Since Zinc is really reactive, when the water was poured, it just explodes, and catches on fire.
The overall formula is:
Zn(s) + NH4NO3(s) → N2(g) + ZnO(s) + 2 H2O(g)