Question

8. Ammonium chloride is also a sublimable solid. Give a reason why sublimation of ammonium chloride
involves a physical & a chemical change?​

Answer 1

Answer:

Ammonium chloride decomposes into ammonia and hydrochloric acid at its sublimation temperature. Answer: Sublimation of ammonium chloride is a chemical change because during the process, two new substances are formed. ... Moreover ammonium chloride is a white solid while the two products are gases.

Answer 2

Ammonium chloride - sublimes on heating & dissociates into ammonia [NH₃]

& hydrogen chloride [HC1], which recombine on cooling to give back - NH₄C1

NH₄C1 [s]  ⇄ NH₃ [g] + HC1 [g]

Hence sublimation of such substances [Ammonium chloride] involves both - a physical & chemical change.