What happen when caustic soda beads are exposed to air for a long time.

Explanation

Caustic soda (NaOH) is a deliquescent substance and becomes wet on exposure to air. On long exposure, the solid beads dissolve in the absorbed water. Moist caustic soda then absorbs carbon dioxide `(CO_2)` from air to form sodium carbonate `(Na_2CO_3)` is not a deliquescent substance the wet sodium hydroxide becomes dry again.
`2NaOH + CO_2 to Na_2 CO_3 + H_2O`