A salt that absorbs moisture from the atmosphere without forming a solution is said to be
Answer Details
A salt that absorbs moisture from the atmosphere without forming a solution is said to be hygroscopic.
Hygroscopic substances have a strong affinity for water molecules and can absorb water vapor from the surrounding atmosphere. This can cause the substance to become damp or even dissolve in the absorbed water.
In contrast, efflorescent substances release water molecules into the surrounding atmosphere and can become dry and powdery. Deliquescent substances can absorb so much water that they dissolve and form a solution.
Insoluble substances cannot dissolve in water and will not absorb moisture from the atmosphere.