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
Correct answer is C
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.