An efflorescent compound is a substance that?
- absorbs water froom the air without dissolving in it
- is capable of giving off coloured luminosity
-
gives out water to the atmosphere
- absorbs water from the air and dissolves in it
- gives out its water of crystallization on heating
The correct answer is: C
Explanation
Efflorescence is a phenomenon where a crystalline salt loses all or part of its water of crystallization when exposed to the atmosphere to form a lower dehydrate or an anhydrous salt.