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Certain substances which are so hygroscopic, when exposed to the atmospheric air at ordinary temperatures, absorb enough water and get completely dissolved
3.
When ionic substances are dissolved in water to make their saturated aqueous solution, their ions attract water molecules which then attached chemically in certain ratio
4.
Copper (II) sulphate pentahydrate
Down:
2.
Magnesium sulphate heptahydrate
3.
Certain substances, when exposed to the atmospheric air at ordinary temperature, absorb moisture without changing their physical state