Question

Why is sublimation considered a physical change? Mention two points.​

Answer 1

$\huge\underline{\bold{\red{AnswEr}}}$

Sublimation is a physical change because it is just the change of a solid substance to it's vapour state,no new substance is formed and it can be again converted to solid this means it is a reversible change whereas in case of slaking of lime CaO reacts with H2O to form Ca(OH)2 and energy,a new substance Ca(OH)2 is formed and it can't be reversed by physical means so,it's a chemical change.