Question

what is efflorescence? Give an example

Answer 1

The formation of a powdery surface on crystals, as a hydrate is converted to anhydrous form by losing loosely bound water of crystallization to the atmosphere.

Answer 2

It is the propeety of some substances to lose water partly or wholly when exposed to dry air even for short time.
Ex-washing soda(Na2CO3. 10H20).
Glauber's salt(Na2SO4.10H2O).