Question

Why is solid ferric chloride stored in air tight bottles?

• A. It is a deliquescent substance.
• B. It is an efflorescent substance.
• C. It is a hygroscopic substance.
• D. It contains water of crystallisation.

Answer 1

The correct option is A

It is a deliquescent substance.

Certain water- soluble substances, when exposed to the atmosphere at ordinary temperature, absorb moisture from the atmospheric air to become moist, and ultimately dissolve in the absorb water, forming a saturated solution.Such substance is called deliquescent substance and the phenomenon is called deliquescence. E.g., caustic soda, caustic potash, zinc chloride, etc.

Solid anhydrous $FeC{l}_3$ is a deliquescent substance which absorbs moisture from the air and then dissolves in absorbed moisture to change it into a liquid state.So, $FeC{l}_3$​ is stored in air tight bottles.