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Certain substances, when exposed to the atmospheric air at ordinary temperature, absorb moisture without changing their physical state. Such substances are called hygroscopic substances and this property is called hygroscopy.
Hygroscopic substances are used as drying agents.
Example: 1. Conc.Sulphuric acid (H2SO4).
2. Phosphorus Pentoxide (P2O5).
3. Quick lime (CaO).
4. Silica gel (SiO2).
5. Anhydrous calcium chloride (CaCl2).
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