Question 48
WaterAn efflorescent compound is a substance that
- A.absorbs water from the air without dissolving in it
- B.is capable of giving off coloured luminosity
- C.gives out water to the atmosphere
- D.absorbs water from the air and dissolves in it
- E.gives out its water of crystallization on heating
Show the answer and explanation
Answer: C (gives out water to the atmosphere)
Explanation
An efflorescent substance (e.g. washing soda crystals) loses water of crystallization to the atmosphere simply on standing in air, without heating.