Specific Compound Spherical Matter-
Compounds that are in crystal form, if kept in air, give some or all of their crystalline water is alum, washing soda etc.
Hygienic Substances
Compounds that absorb air moisture to form hydrates hydroxides but do not form saturated solutions. For example anhydrous copper sulphate, extinguished lime etc.
Precipitated Substance
Compounds that take up moisture from the air to form a saturated solution. Such as sodium hydroxide, anhydrous ferric chloride calcium chloride, potassium hydroxide.
Fluorescent Substance
Some substances that absorb visible light and when there is absence of light, they emit it.
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