It is a colorless solid. The chlorate is an oxidizing agent and the ammonium is a reducing agent, making it a little explosive. It explodes when in sunlight for a few minutes. It should never be crystallized as it can explode without any detonation. It can catch flammable things on fire. It decomposes completely to nitrogen, chlorine, and oxygen when heated gently.
It is used to make barium chlorate.